Skinny Bristol Palin Shows Off Amazing Legs, Booty at DWTS Rehearsal

Bristol Palin is tanned, toned and ready to cha cha again for week two of Dancing With the Stars: All-Stars!

The single mom of three-year-old Tripp impressed fans and critics alike with her hot new figure on the September 24 premiere of ABC's DWTS, and as the fifteenth season heads into its second week, Palin is having fun flaunting her slimmer self.

On Sunday, Palin, 21, headed to rehearsal with pro partner Mark Ballas in L.A. wearing gray clingy short shorts that showed of her muscular legs and toned derriere.

Bristol Palin at dance rehearsal for Dancing With The Stars on September 30, 2012.
Credit: Phamous/Splash News

Returning to the series two years after her season 11 stint on the show, Palin told Us Weekly she's developed a new-found confidence she hopes will take her all the way to the DWTS: All-Stars finale. And of course, a revamped diet and fitness routine have helped Palin (who placed third in 2010) whittle her middle.

"I'm definitely in better shape than I was last time, definitely. I'm just more active and I cut all the crap out of my diet! It's that simple," Palin said after DWTS judge Carrie Ann Inaba declared her the "most improved" returning contestant. "And my kid's a lot more rowdy, a lot more active. I'm running after him a lot! He's huge! He thinks he's a teenager already."

VIDEO: Kirstie Alley wants to become a "size zero" during DWTS: All-Stars

Palin's partner Ballas has definitely noticed an improvement in his celeb's work ethic. "Mark says he's like a chimpanzee and I'm like a turtle, poking out of my shell!" Palin has said.

Christina Aguilera: I Was Forced to Be "Toothpick Thin" in 2002

Christina Aguilera is taking control of her music and of her body.

Appearing on the September 29 cover of Billboard magazine, the 31-year-old singer opens up about the struggle to stay thin in the music industry. "During the promotion of my album Stripped [in 2002], I got tired of being a skinny, white girl," Aguilera says. "I am Ecuadorian but people felt so safe passing me off as a skinny, blue-eyed white girl."

"The next time my label saw me, I was heavier, darker and full of piercings!" the five-time Grammy Award winner laughs. "Let me tell you, that wasn't an easy pill for them to swallow. I had gained about 15 pounds during promotion and during my Stripped tour [with Justin Timberlake, 31]. They called this serious emergency meeting about how there was a lot of backlash about my weight. Basically, they told me I would effect a lot of people if I gained weight -- the production, musical directors."

"[They claimed] people I toured with would also miss out if I gained weight because I would sell no records or tickets for my shows," she adds. "I was young, so I lost the weight quickly and was toothpick thin during Back to Basics promos and touring."

Christina Aguilera
Credit: Billboard Magazine

The "Your Body" singer, dating production assistant Matthew Rutler, had finally had enough in 2012. "I told them during this Lotus recording, 'You are working with a fat girl. Know it now and get over it.' They need a reminder sometimes that I don't belong to them. It's my body," Aguilera tells the magazine. "My body can't put anyone in jeopardy of not making money anymore—my body is just not on the table that way anymore."

After the critical and commercial failure of her 2010 album Bionic, Aguilera hopes Lotus (in stores November 13) will remind music lovers of her true talent. "This album represents a celebration of the new me, and to me the lotus has always represented this unbreakable flower that withstands any harsh weather conditions in its surroundings, that withstands time and remains beautiful and strong throughout the years."

"Once I could start writing my own songs, beginning with Stripped, I tried to infuse as much as I could to promote strength and inspire people with that message," Aguilera explains. "And now I'm at a place at 31, where the last time I felt this way was when I was 21 with Stripped and I had a lot to say and a lot to express."

Jennifer Garner Reveals Toned Arms in Strapless Red Dress at Butter Premiere

Red hot mother of three!

Jennifer Garner looked super sexy at Thursday's NYC premiere of Butter in a red strapless Gucci dress.

The 40-year-old wife of Ben Affleck -- and mom to daughters Violet, 6, Seraphina, 3, and son Samuel, 7 months -- flaunted her slim, toned bod at AMC Lincoln Square Theater.

Garner plays a very type-A mom in the new film, but the actress insists she's nothing like that in real life. 

"I am not like her in any way, shape or form!" she told reporters.

"It was just fun. What was so great about playing this role was getting not to be myself," she added. "I'm sick of myself! I went totally the other way and I had a blast.

Joining costars Olivia Wilde, Alicia Silverstone, the busy mom hit the after-party for Butter hosted by Appleton Estate Reserve and Cinema Society at The Double Seven.

Alicia Silverstone and Olivia Wilde at the party for "BUTTER" at The Double Seven in NYC on September 27, 2012.
Credit: Nicholas Hunt/PatrickMcMullan.com

During a recent interview with Ellen DeGeneres, Garner said she's happy with having three children -- but husband Affleck, 40, would like more!

"I am not pregnant right now," Garner said on The Ellen DeGeneres Show. "I plan to be done. But my husband is kind of a wonder sperm kind of guy."

"You never don't know," she added. "You just have a look at him!"

Colton Haynes: "I Just Lost 16 Pounds of Muscle"

Staying in shaping isn't easy -- just ask Teen Wolf actor Colton Haynes!

At the Cybergeddon premiere in West Hollywood September 24, the former male model, 24, admitted he's not as burly as he was while filming the MTV series' second season just a few months ago. "I just lost 16 pounds of muscle, but I'll get it back -- it's easy!" Haynes told Us Weekly. "It's so hard to keep it on."

Haynes explained he works with "amazing trainers" to sculpt his bulging biceps and perfect pecs. "I haven't had [a session] in a while, which is why I dropped a little weight, but I'm a huge fan of yoga and spin class," the actor said. "Spin class is the best for your core!"

Of course, exercise isn't enough to keep Haynes' body in mint condition. "Unfortunately, diet is 75 or 80 percent of trying to get in shape, so you do have to try to cut the carbs," he told Us. "The diet's a huge part! I'm from Kansas, so I love ranch dressing and McDonald's. When I'm working, I have to stay away from all that!"

Luckily, eating healthy hasn't interfered with the single actor's love life. "The good thing is when you're going on dates, you want to go to a nice place, so they're [probably] serving chicken and steaks," he explained. "You can eat them with vegetables, so you're good."

Though Haynes was recently (and falsely) linked to Pretty Little Liars actress Lucy Hale, 23, the the hunky star admitted Chris Zylka's ex "is such a special girl in my life." As for what he desires in a significant other, Haynes revealed he's looking for "someone who just wants to have fun and isn't afraid to go out in jeans and a hoodie and just hang out."

Kim Kardashian Reveals Tiny Waist in Gold Belted Swimsuit

Perhaps this will get Kanye West's attention!

On September 24, Kim Kardashian shared a sexy self-snapped picture of herself via Twitter. Revealing her tiny waist, the voluptuous E! reality star, 31, rocked a white Michael Kors swimsuit with a gold belt.

The buxom brunette has never been shy about showing off her curves, telling the September issue of Prestige Hong Kong, "You have to really know your body. Everyone has a body part that they don't like and want to conceal, and something that they like and want to show off. So it's all about knowing what you want to show."

VIDEO: Why Kim Kardashian felt "honored" to be killed on South Park

"If you have long legs, you might want to wear short skirts and show your legs off. If you have a small waist, you can always wear belts and do what you can to accentuate your waist," she added. "Or if you want, you can cover up your arms. For me, when I feel good in something, I feel confident."

After a "long day" at the beach in Miami September 24, Kardashian struggled to get some shuteye. "Can't sleep again tonight!" she tweeted. "Maybe it's because my baby Kanye isn't here to cuddle."

Luckily, West, 35, is there in spirit; The "Gold Digger" rapper recently bought his girlfriend a Teacup Persian kitten named Mercy.

Slim, Sexy Jessica Simpson Eats Steak, Chocolate Dessert at Pal's Birthday Party

Treat yoself, J-Simps!

New mom Jessica Simpson has been working hard on her postbaby slimdown -- and clearly, those efforts are paying off.

The Fashion Star mentor, 32, looked radiant on her way in to a pal's birthday dinner Saturday night, showing off lean, toned legs in a super short, sparkly Boyod dress. (By her side for her night out? Fiance Eric Johnson.)

At the celebration -- which took place at L.A.'s Fig & Olive restaurant -- Simpson took a night off from her diet and indulged in Fig & Olive salad, filet mignon, and the Chocolate Pot de Creme for dessert. (She also sipped on a Bellini and took part in a champagne toast honoring the birthday girl.)

According to an eyewitness, new parents Simpson and Johnson, who welcomed daughter Maxwell May 1, were set on making the most of their night out together.

Even though there were more than 20 guests at the get-together, "They were whispering into each other's ears and smiling and laughing a lot," the witness tells Us Weekly. "They spent the majority of the evening engaged in each other's company."

Lady Gaga Poses in Underwear, Says She's Battled "Bulimia and Anorexia Since I Was 15"

Lady Gaga is starting her own "body revolution."

On September 25, the "Born This Way" singer, 26, shared a somber photo of herself wearing yellow lingerie via her Little Monsters website. "[I've battled] bulimia and anorexia since I was 15," Gaga wrote in the caption.

The revelation comes on the heels of the singer's recent radio interview with Elvis Duran, in which she admitted to being on a diet "because I gained, liked, 25 pounds" during her five weeks off between tour dates.

At the time, the Grammy Award winner insisted she didn't "feel bad about" putting on a few extra pounds. "Not even for a second."

"I have to be on such a strict diet constantly," Gaga explained. "It's hard because it's a quite vigorous show, so I tend to bulk up, get muscular, and I really don't like that. So I'm trying to find a new balance."

Proving she's more than just a number on a scale, Gaga shared some words of wisdom from Marilyn Monroe via Twitter September 22: "To all the girls who think you're ugly because you're not a size 0, you're the beautiful ones. It's society who's ugly," the singer quoted the late blonde bombshell as saying. Gaga then added, "Thank you to my fans who love me no matter what  and know the meaning of real beauty and compassion. I really love you."

Months earlier, legendary musician Elton John, 65, said he was concerned about his pop star pal's tiny frame. "She is frail, and she doesn't eat when she should," John said of Gaga. "I know how tiny she is and I do worry about her, yes."