Jordin Sparks Shows Off 50-Pound Weight Loss at Sparkle Premiere

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Jordin Sparks didn't need an over-the-top sequined gown to shine at the Sparkle premiere in NYC Tuesday.

Instead, the film's star, 22, donned a minimalist, red peplum sheath (with matching patent leather stilettos) which showed off her incredible 50-pound weight loss.

At the Teen Choice Awards last month, Sparks opened up to Us Weekly about the key to her jaw-dropping body makeover, which she first debuted last spring.

"There is no secret," the Season Five American Idol champ shared. "It's just better eating and working out! It's definitely a daily thing."

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Jordin Sparks attends the unveiling of "Because of You" on October 6, 2010 in New York City.
Credit: Mike Coppola/FilmMagic

One of her favorite ways to stay active? High-energy dance classes like Zumba.

"My mom's best friend is a Zumba instructor and I loved it," she gushed. "I started with walking then went to jogging and then Zumba." In addition to her cardio-heavy classes, "I started [working with a trainer] and we did 30 minutes of circuit training," Sparks says. "So I didn't feel like I needed to be in the gym for two hours."

Sparks' lifestyle changes have paid off big time -- this summer, the pop star landed the August cover of Shape, where she flaunted her slimdown in a barely-there bikini.

VIDEO: Jordin Sparks surprises a fan with an at-home visit

"I could only dream of having a cover and looking like that," she told Us. "I thought, 'I did it!' I had to walk back to my dressing room and . . . pull myself together because I was overwhelmed. I cried. I shed a little tear."

Tim Tebow Poses Shirtless in Sexy GQ Photo Shoot

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Tim Tebow has never looked quite like this!

The devout quarterback, 25, made headlines in February when he decided to appear fully clothed in his Jockey Underwear ads, but in the September issue of GQ, the athlete doffs his top and shows off his chiseled chest and six-pack abs in a photo spread by Mark Seliger.

The 6-foot-3 pro was traded from the Denver Broncos to the New York Jets in March, eliciting mixed reactions from the sports community. Though it's too early to predict how Tebow will perform, he hopes fans will give him a fair shot.

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Tim Tebow
Credit: Mark Seliger/GQ

"I think if they're a Jets fan, hopefully they'll be rooting for me. I'll do whatever I can to help this team win football games. I'll give my heart and soul whenever I step on that field and even when I'm on the sidelines," he tells GQ's NFL Kick-Off issue. "And at the end of the day, that's really all you can ask of someone."

When asked if being left-handed will affect the Jets' offense, Tebow laughs. "There isn't too much I can do about that," he says.

Carolina Panthers quarterback Cam Newton, 23, also appears on a separate cover of GQ's September NFL Kick-Off issue.

Ashley Greene Unveils Sexy, Athletic Bikini Body in Malibu!

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Ashley Greene's frequent workouts have paid off!

The Apparition actress, 25, showed off her seriously sexy bikini body in Malibu August 12. Wearing an olive green two-piece, Greene unveiled her toned abs, lean legs and sculpted arms while paddleboarding in the Pacific Ocean.

Greene, who was accompanied by an unidentified male companion, recently shared her fitness secrets with Us Weekly. "I think you have to change it up so you don't get bored," she said at NYLON magazine's August issue party in Hollywood July 31. "My friend the other day was like, 'I just got this Groupon for paddle boarding! So we're going to go do that. It's a really good workout and I'm a water person."

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Ashley Greene shows off her amazing bikini body while paddling boarding at the beach in Malibu on August 12, 2012.
Credit: AKM Images / GSI Media

"I've done surfing, I've done Pilates, I've done dance, so honestly, [my workout] is just a little mishmash of everything," Greene added.

The actress -- whose new movie, Apparition, is in theaters August 24 -- also dropped hints about what fans can expect in The Twilight Saga: Breaking Dawn - Part 2.

"Everyone has been wanting to see Renesmee being born and the interaction with her, so everyone is going to get to see a little bit of that," she said of the half-mortal, half-vampire baby born to Kristen Stewart and Robert Pattinson's characters.

As for her own character, Alice Cullen, "it's a lot of the same thing with her, being that supportive rock for Bella and Edward and not really choosing sides" Greene told Us. "Then, you know, we always throw in a little fight sequence. Alice always has a very graceful, very fun fight sequence, so we'll see that."

The Twilight Saga: Breaking Dawn - Part 2 is in theaters November 16.

How Kate Beckinsale, 39, Maintains Her Super-Sexy Figure

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Known for fighting her way across the silver screen, Kate Beckinsale, who turned 39 last month, knows staying in action-hero shape is no easy feat. Here's how the Total Recall stunner keeps her body in fighting power.

She varies her workouts: Beckinsale doesn't just stick to one routine. The Brit bombshell is a longtime client of celeb yogini Mandy Ingber, who told us that she works with the star several times a week whenever the actress is in L.A., saying, "She is extremely dedicated to her practice and keeps it pure." Beckinsale has also spent time with trainer Ramona Braganza, who worked with the actress on cardio, circuit training, and core-specific exercises. It also comes down to dedication: she takes her training for movie roles seriously, training five days a week, hours at a time.

She keeps it real: A solid fitness routine is tough work, something the Underworld: Awakening actress knows all too well -- she never even stepped foot into a gym until scoring a role in Pearl Harbor. While her action roles force her to do some serious training, she scales back when she's in between movies and told ELLE UK, "I just can't make it part of my daily life. I go to the gym when I have to, and if I have to bulk up or slim down for a film, I will. I've recently got back into exercising four times a week. I run for half an hour at a time but never outdoors as I don't exercise in public. My gym's in my garage at home."

She keeps a (mostly) healthy diet: Whether she is on set, using the Sunfare at-home delivery service, or cooking for herself, Beckinsale keeps it healthy. A typical day for her involves eggs or oatmeal for breakfast, a chicken or veggie wrap for lunch, and fish and veggies for dinner. But it's not all uber-healthy foods for the star; she's said that she'll never turn down a cupcake, piece of birthday cake, or any other cake for that matter!

Kelly Clarkson's Amazing Slimdown: All the Details!

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Kelly Clarkson is looking' good, y'all!

Recently dropping 30 pounds thanks to an intense new workout routine and a portion-control diet, American Idol's inaugural champ, 30, slimmed down and can't be more thrilled with her new figure. Still, she insists there in no secret to her weight loss -- just the tried and true diet and exercise.

"It's just trying to eat a little better and work out a little more," the singer told Us Weekly during a recent taping of her ABC series Duets. "But no matter what size I am I love performing no matter how big or little I am! I feel good."

A big motivating factor for Clarkson to revamp her bod these days? New boyfriend Brandon Blackstock, the stepson of country crooner Reba McEntire. "Brandon is the first guy who ever tell her how beautiful and sexy she is," a source says of the Nashville-based talent manager. "She wants to look good for him."

Here, Us Weekly outlines Clarkson's weight loss journey and looks at how she transformed from Idol's girl-next-door to a bonafide bombshell superstar.

Jennie Garth Attributes Weight Loss to Post-Divorce Stress

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Jennie Garth's sudden slimdown raised a few eyebrows earlier this week, but the Eleventh Victim actress insists she's perfectly healthy.

According to Garth, 40, her recent weight loss is a result of her March split with Peter Facinelli, 38, her husband of 11 years and father to her three daughters, Luca, 15, Lola, 9, and Fiona, 5.

"I've been certainly going through a transitional time in my life and I think anybody who has been through something like what I'm going through, and have been going through for the past couple years, can definitely relate that your body changes with your emotional state of mind sometimes," she told ET Canada August 8. "I think a lot of women can relate to that."

Garth, who romanced HGTV star Antonio Ballatore post-divorce, added that she's trying to encourage her girls to eat healthier, too.

"There's lots of fresh fruits and vegetables. We have so many fruits at our ranch where we've been living, so eating healthy, especially with three girls, body image is something that I try to set a good example for them," Garth explained.

"Every one of my girls is a different size and shape and I want them to be comfortable in their own skin and be healthy-minded as well as physically."

Garth has been focused on her fitness, and in May, she tweeted that her trainer "made me flip a ginormous tractor tire over. Like 50 times. I feel like Mr. T."

Despite her tinier frame, a source tells Us Weekly that Garth "doesn't look too skinny in person. . .She looks like the old Jennie."

Jessica Simpson: I'm Feeling "Inspired" About Dieting

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Jessica Simpson is in it to win it!

As part of a $4 million deal with Weight Watchers, the 31-year-old first-time mom is psyching herself up revamp her eating and fitness routines -- and is she sharing the journey with her 5.5 million Twitter followers.

"What we put in our bodies mirrors our Self-Worth!" the singer and fashion mogul wrote. "#INSPIRED."

One example of junk-food-loving Simpson's dietary evolution? The one-time lover of Scotch and margaritas kicked back last Saturday night with a big glass of…water!

"Responsibility has drastically changed my life "Saturday night drink of choice.... WATER! :)" said the star, who welcomed daughter Maxwell Drew Johnson May 1 with fiance Eric Johnson.

Back in late winter, the then-heavily pregnant star told ELLE mag abstaining from booze was a challenge at first.

"Givin' up my Scotch? My Macallan 18? That was hard for me! Though now being pregnant, you crave other things. A big thing of water sounds great!"

According to a source, the star gained 70 pounds during her pregnancy.

"[Weight Watchers] focuses on healthy habits for the long-term (and I can still indulge in my guilty pleasures every now and then, too)," the new mom explained on Facebook. "I have actually gotten a group of friends together who are going to be doing it with me."

Jake Gyllenhaal: I'm Done "Exercising Regularly"

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Fitness fanatic Jake Gyllenhaal is taking a breather.

In the September issue of Details, the 31-year-old actor says his notoriously grueling workouts are a thing of the past. "I haven't cycled in a long time," he reveals. "I don't run anymore. Do I take care of my body and take conditioning seriously? Yes. But exercising regularly doesn't fit the energy of the character I'm playing now," he says of An Enemy, in which he plays a man who seeks out his look-alike.

Gyllenhaal -- whose famous exes include Reese Witherspoon, 36, Kirsten Dunst, 30, and Taylor Swift, 22 -- says he's become a different man since he shot the police thriller End of Watch, directed by David Ayer. "Dave told me right off that this was going to affect my soul," Gyllenhaal explains. "'Friends are going to say, That's the Jake I've always known, but somewhere deep inside, you'll know otherwise.'"

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The actor spent five months prepping for the 22-day shoot, which included "three nights a week in ride-alongs with cops," Gyllenhaal recalls. "[We had] fight training every morning at a Kenbo Karate dojo, and I got the sh-t kicked out of me. Then [we went to] the shooting range, shooting past each other's heads, with live ammo."

VIDEO: Why Taylor Swift is "haunted" by Jake Gyllenhaal

"There's a simulated fire in the movie, but Dave wanted us to feel what that's like, so he had us do a controlled burn," Gyllenhaal adds. One Saturday, the actor and his costar, Michael Pena, 36, "drove down to Orange County, dressed like firemen head-to-toe, and suddenly we're there just sitting in the middle of a burning building."

According to Gyllenhaal, the film -- in theaters September 28 -- inspired him to go with his gut.

"Every journey starts with fear. And I could say that's what I want to embrace now. A real experience," he tells Details. "And I want, overall, to trust what I know is right. There have been many times when I haven't. It's what I'm asking myself: Where is the line? What is the line? There's so much context, it can be almost impossible to find."

Jessica Simpson Drinks Water, Not Alcohol, on Saturday Night

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No more margaritas for Jessica Simpson?

On Saturday, the new mom to daughter Maxwell Drew Johnson announced to her 5.4 Twitter followers that she was laying off booze.

"Responsibility has drastically changed my life!" Simpson, 31, wrote. "Saturday night drink of choice.... WATER! :)"

Breastfeeding little Maxwell, now 3 months, Simpson (a well-known fan of the margaritas at high-end Mexican chain Dos Caminos) has more than one reason to eschew too much booze: Having inked a deal with Weight Watchers, she has until the end of August to lose 20-30 pounds of the estimated 70 she gained while pregnant with her first child.

"Jessica has always had issues with junk food," an insider told Us Weekly of the star, who's training again with celeb coach Harley Pasternak.

The singer and fashion designer stepped out last week in L.A. with her family, and covered up her curves in a brightly colored printed caftan, and wore sky-high platform heels.

"[Weight Watchers] focuses on healthy habits for the long-term (and I can still indulge in my guilty pleasures every now and then, too)," the new mom explained on Facebook. "I have actually gotten a group of friends together who are going to be doing it with me."

Jessica Simpson Drinks "Water," Not Alcohol, on Saturday Night

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No more margaritas for Jessica Simpson?

On Saturday, the new mom to daughter Maxwell Drew Johnson announced to her 5.4 Twitter followers that she was laying off booze.

"Responsibility has drastically changed my life!" Simpson, 31, wrote. "Saturday night drink of choice.... WATER! :)"

Breastfeeding little Maxwell, now 3 months, Simpson (a well-known fan of the margaritas at high-end Mexican chain Dos Caminas) has more than one reason to eschew too much booze: Having inked a deal with Weight Watchers, she has until the end of August to lose 20-30 pounds of the estimated 70 she gained while pregnant with her first child.

"Jessica has always had issues with junk food," an insider told Us Weekly of the star, who's training again with celeb coach Harley Pasternak.

The singer and fashion designer stepped out last week in L.A. with her family, and covered up her curves in a brightly colored printed caftan, and wore sky-high platform heels.

"[Weight Watchers] focuses on healthy habits for the long-term (and I can still indulge in my guilty pleasures every now and then, too)," the new mom explained on Facebook. "I have actually gotten a group of friends together who are going to be doing it with me."

Miley Cyrus Displays Super-Tiny Waist in "Fiance Jeans"

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Miley Cyrus has definitely met her fitness goals.

Back in the spring, she defended herself against critics of her super-svelte body -- one she honed via frequent Pilates sessions and, more controversially, a gluten-free diet.

Now engaged to Liam Hemsworth, the 19-year-old singer and actress showed her nearly 7 million Twitter fans just how svelte she's become in a eyebrow-raising TwitPic early Friday.

"My 'Fiance' jeans. but for real though." the former Disney starlet wrote of a pic in which her teeny-tiny waist is on full display as she wears baggy green pants (which may or may not belong to Australian actor Hemsworth, 22) and a tight, striped cropped-top T.

"For everyone calling me anorexic, I have a gluten and lactose allergy," Cyrus  said back in April. "It's not about weight -- it's about health. Gluten is crap anyway!" the "Can't Be Tamed" singer said of her avoidance of gluten, a protein found in wheat.

Cyrus was back in the news on Thursday after she was the target of a so-called 911 "swatting" prank call -- in which L.A. police rushed to her home after an impostor called in, claiming a possible invasion and/or kidnapping.

Good Morning America reports that officers surrounded Cyrus' home with guns drawn -- only to discovered that no one was home, with no stolen property. They concluded it was likely a "swatting" prank, in which jokesters provoke SWAT teams to break down the doors of innocent people. Cyrus has been in Philadelphia as Hemsworth shoots Paranoia.

Jennifer Aniston Wears Tiny Daisy Dukes, Skintight Tanktop as Prostitute in Film

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Fabulous and 43!

Playing a prostitute in We're the Millers, Jennifer Aniston has thus far stayed frumpy and covered up as she shoots the dark comedy with Jason Sudeikis and Emma Roberts in Wilmington, North Carolina. That all changed on Thursday, when the actress was snapped on set showing off her Yoga-taut figure in a super-skimpy look: Tiny, ripped Daisy Duke jean shorts and a clingy, skin-tight white tank top. Aniston (whose man Justin Theroux has stayed behind in NYC) wore her dirty blonde locks in a casual up-do, and appeared to be wearing minimal makeup and just gold earrings, pendant necklace and a simple bracelet.

In the film, Sudeikis plays a pot dealer attempting to smuggle a huge shipment of marijuana across the country -- hiring Aniston's prostitute as his fake wife.

Before Thursday's eye-catching ensemble, Aniston has been seen in much less revealing downright dowdy attire for the film.

"First day of filming on We're The Millers," Aniston's star-struck costar Emma Roberts, 21, tweeted last month. "So excited I woke up an hour early which I can assure you never happens." On July 17, Roberts tweeted that working with Aniston is a "dream come true."

Before getting down to work on the film last month, Aniston and beau Theroux, 40, enjoyed an extended European vacation capped off by a sun-filled, five-day trip to the island of Capri -- which included a June 19 jaunt on a rented luxury yacht, where Aniston showed her famous body in a skimpy two piece.

Heidi Montag: I'm Grateful My Plastic Surgeries Weren't "Really Disastrous"

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Heidi Montag became an over-the-top version of herself after undergoing 10 plastic surgery procedures in one day in 2010.

Though she's shunned the spotlight since then, the former Hills star, 25, recently opened up to Celebuzz about why she'll never go under the knife again. "It was a lot more than I could have expected," she admitted. "I really hate talking about it now because it was so long ago. I was a much different person back then to who I am now. I didn't realize how much of The Hills -- and going through that -- would define who I am."

Montag -- who got brow-lifts, ear-pinnings and a chin reduction, among other improvements -- told Celebuzz she's "really thankful" her body didn't become disfigured post-surgery. "It could have been really disastrous."

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Heidi Montag on April 27, 2010

"I lived and I learned, and I wouldn't really recommend it for other people. It was a lot harder than I thought it would be going through it -- physically, mentally, emotionally, recovering," she said of having work done. "But, I'm just glad it's done and that everything healed so well."

VIDEO: Heidi Montag's mom reacts to her shocking surgeries

Lauren Conrad's former BFF (who released an EP, Dreams Come True, in April) added that she has a few projects lined up, but felt it was premature to reveal any details. "I'm really looking forward to the next phase in my life," explained Montag, who married Spencer Pratt, 28, in November 2008. "I know I'll never be able to get away from a lot of [my past], but I won't give up trying to prove I'm more than just that."