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."