Christina Aguilera's fluctuating weight doesn't bother her as much as it seems to bother her critics.

Appearing on the October cover of Lucky, the Pennsylvania-raised Grammy Award winner opens up about her curvier shape, telling the magazine she's happy to show off her fuller figure in a myriad of tight outfits.

"The challenge I've always had is being too thin, so I love that now I have a booty," Aguilera explains. "And, obviously, I love showing my cleavage."

Though her shapely appearance has often been the subject of ridicule, Aguilera doesn't pay attention to the naysayers. "Hey, if you can work it and you can own it, that confidence is going to shine through," the blonde star says.

Christina Aguilera
Credit: Robert Erdmann for Lucky

Aguilera wasn't always so confident in her own skin. When her career was just taking off, the pop princess struggled to find her own voice. "When you're young, it's so easy to get bull­dozed," she says. "There were these two ladies who worked at the record label who always wanted to come to fittings and dress me up like a Barbie doll. It was disgusting."

Dating production assistant Matthew Rutler since late 2010, the Voice mentor (and mom to Max, 4, with ex-husband Jordan Bratman) is eager to share her new music with fans.

"If you love 'Fighter,' you're going to love my new album," she tells Lucky, referencing her triumphant hit single from her 2002 sophomore album, Stripped. "As a 31-year-old woman, I've been uncovering my independence, and it's been really fun to explore in the new songs."

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She's inspired legions of overweight Americans to shed unwanted pounds thanks to her work on NBC's The Biggest Loser, but tough-as-nails trainer Jillian Michaels has waged her own battle of the bulge since becoming a mom.

Bringing adopted daughter Lukensia, 2, home from Haiti less than a week after her partner Heidi Rhoades gave birth to their son Phoenix in May, Michaels tells the October issue of Redbook magazine that she found herself carrying around a few extra pounds after her family expanded.

"I went to interview Suze Orman for The Insider, and her wife said, 'You're chubby! And Suze said, 'You look like a mommy now,'" Michaels -- who just inked a deal to return as a trainer on The Biggest Loser for this winter's season 14 -- recalls of her friends. "I look at my body and I go: 'five pounds heavier.' But part of me really likes it."

As she and Rhoades raise their son and daughter, Michaels tells Redbook she looks to voluptuous celebrities like Beyonce rather than stick-thin models to inspire a healthy body image in her kids. "We talk about role models for her, like Beyonce, who has a more curvaceous figure," says the trainer, who also appreciates the bootylicious singer's hot bod. "My taste has changed. I prefer that look. For now, I want to look a little softer."

Deciding to return to The Biggest Loser after a two-season hiatus, Michaels will work with the show's first-ever kid participants, ages 13-17, in a bid to raise awareness of the growing childhood obesity epidemic. "Having recently become a mother of two, I am more passionate than ever about helping empower children and families with the information and resources they need to live a healthier life," she has said.

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She gave birth to her fourth child just two weeks ago, but Kim Zolciak is apparently bouncing right back.

The Real Housewives of Atlanta star, 34, welcomed son Kash Kade Biermann Aug. 15 with husband Kroy Biermann. But by Sept. 1, Zolciak's post-baby body was looking seriously svelte.

Her daughter Brielle, 15, Tweeted a gasp-inducing pic of her reality star mom in a long, tight black dress and quipped what everyone else was thinking.

"Seriously . . . who looks like this after 2 weeks of having a baby?"

No word yet on how Zolciak -- who's admitted to hating exercise on Real Housewives -- is dropping the pounds. Kash Kade joins big brother KJ Biermann, 15 months, plus Brielle and Ariana, 9, the Bravo star's daughters from a previous relationship.

VIDEO: See Kim without her wig!

Zolciak and Atlanta Falcons player Kroy, 26, wed in Nov. 11, 2011 in a wedding taped for their Bravo spinoff Don't Be Tardy for the Wedding.

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Jessica Simpson is taking her post-baby weight loss efforts seriously -- and it's paying off, big time.

On Sunday, the mom to Maxwell headed to LAX to catch a flight to NYC. Before boarding her flight, Simpson, 32, looked comfy, casual and slimmer than ever in a black tunic and formfitting black pants.

Jessica SImpson
Credit: Sharky/Splash News

The Fashion Star mentor is slated to make her first public appearance since giving birth four months ago during a chat with Katie Couric on the TV host's new talk show Monday. See more photos of Jessica Simpson's post-baby body.

Last week, Simpson opened up to Us Weekly about her success using Weight Watchers so far.

"I'm 10 pounds away from my pre-baby size," said the singer/designer, who got up to 170 pounds while pregnant.

In addition to adhering to the popular point-based eating plan, Simpson said she's working out four times a week with celeb trainer Harley Pasternak.

"Her waist is going in, and her thighs are getting smaller," Pasternak said of his A-list client's progress so far.

Though she still has a little bit of work to do before she's back to her goal weight, Simpson is confident she can make it happen. Now that she's a mom, she told Us, "I believe I can do anything!"

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Jordin Sparks' jaw-dropping new bikini body is definitely something to sing about.

During a recent getaway to the Bahamas with boyfriend Jason Derulo, the singer/actress showed off her 50 pound weight loss -- which she first debuted last summer -- in a sexy, printed bandeau top and black bikini bottoms.

Earlier this summer, the Sparkle star, 22, opened up to Us Weekly about how she lost the weight -- and how she's successfully kept it off.

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

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

One of her favorite ways to stay fit is with high-energy dance classes like Zumba.

"My mom's best friend is a Zumba instructor and I loved it," she said. "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 revealed. "So I didn't feel like I needed to be in the gym for two hours."

Sparks' hard work has paid off big time; this summer, the pop star donned a bright blue bikini on the cover of August's Shape magazine.

"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."

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Dust off the Daisy Dukes!

Four months after Jessica Simpson welcomed daughter, Maxwell (with fiance Eric Johnson, 33), the star says: "I'm 10 pounds away from my prebaby size!" She shares the secrets of her success on Weight Watchers with Us Weekly.

7 a.m. Simpson, 32, wakes to feed Maxwell, then eats breakfast: half a Flatout flatbread sandwich with egg whites, peppers and fat-free cheddar (6 PointsPlus).

8 a.m. Simpson straps on her pedometer and hits the streets with Johnson and Maxwell. "I'm trying to do at least 14,000 steps a day," she says. Afterward: a snack of berries, bananas, melon or grapefruit (0 PointsPlus).

11 a.m. Four days a week, Simpson reports to trainer Harley Pasternak for a 45-minute session. After a cardio warm-up, it's circuit time: seven sets (up to 30 reps each) of dumbbell triceps extensions, hamstring curls and crunches with a medicine ball throw. "Her waist is going in, and her thighs are growing smaller," says Pasternak.

12:30 p.m. If it's Wednesday, she weighs in at home with her mom and pals.

1 p.m. "I make lunch my biggest meal to keep me full through the day," she says. One favorite: spinach salad with 4 ounces of chicken satay and pear (8 PointsPlus).

2 p.m. Stroller walk with Maxwell, or hoof it at home on the treadmill watching 24. Her reward: a WW berry smoothie (3 PointsPlus).

6:30 p.m. Bathtime and bed for Maxwell, then dinner for Mom! It's often fish (4 ounces of halibut or tilapia) with roasted eggplant, broccoli or asparagus (6 PointsPlus). And for dessert? Skinny Cow chocolate truffle bars (3 PointsPlus).

10 p.m. Lights out.

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