Jordin Sparks

Jordin Sparks the "American Idol" winner showed off her slimmed down figure with a sexie selfie on Instagram. Sparks lost an impressive 50 pounds and looks like her hard work has paid off. (Instagram/XX17online/Reuters)

Kelly Clarkson

Kelly Clarkson the former"American Idol" winner gave a rocking performnace at the Billboard Awards Sunday, but the talk of the night was her newly slimmed figure, a drastic change from her previous look(left). The singer has made a point to say she doesn't care about her weight. But if those are the results of not caring, sign us up! (Reuters/AP)

Mariah Carey

Mariah Carey has been making the rounds lately showing off her newly-slimmed physique after giving birth to twins ealier this year. The pop diva said she lost 40 ibs of bloat, and dropped an additional 30 using Jenny Craig. She is now a spokeswoman for the brand. "The whole point of this is not just like: 'oh, hey, look at me and my weight loss, I'm fantastic.' It's really health, " she told rosie O'Donnell in an appearance on her show. "Like I said, I learned it when I bacame helpless and felt so vulnerable like never before in my life." (X17 online/Life and Style)

Jonah Hill

Jonah Hill also a very funny guy. He dropped 40 pounds this year after working out with a personal trainer and a nutritionist. The "Moneyball" star he thought it was important to be healthier so he changed his lifestyle. Of the weight loss he said, "It's not fun. I wouldn't say it's the most fun endeavor I've ever took on in my life. But it's important and I'm enjoying it." (Reuters)

Kirstie Alley

Kirstie Alley has famously been up and down with her weight over the years, even admitting to People magazine in 2009 that she had gained 83 pounds. Through an organic diet program she created and all that dancing on "Dancing With The Stars," Kirstie says she has dropped down to a size 6 and even an occasional size 4. (People/X17 Online)

John Goodman

John Goodman again is down by 100 ibs! He showed off his new svette physical on Letterman explaining that he was "pushing 400" or "somewhere up around there" when he was his heaviest. "I'd lose 60 pounds every spring, and then i got too fond of the barley com and i'd just start missing it too much," he explained, "and then it would screw everything up. I'd gain it all back and then some every year." This 58-yeras old man or actor says that he doesn't want to "go nuts" and lose more weight. "I'm not going to look like Paris Hilton or any thing like that," he joked. "It's going to be an ongoing process for the rest of my life." How's he maintain his new weight? "I'm getting a lot of exercise, i feel great," he said. (Reuters)

Jennifer Hudson

Jennifer Hudson again looking totally different from last time. Jennifer Hudson the "Dreamgirls" star went from a size 16 to a size 6 with weight watchers. "i don't want to lose ant more weight," she told Instyle. "You're never going to see me skinny...I think this is a good, natural size for me." but the she stepped out Even thinner, and is reportedly now size 4. (AP)

Nicole Eggert

Nicole Eggert "Baywatch" star, she jump-started her 15 pound weight loss with a stint on the reality show "Celebrity Fit Club."

Khole Kardashian

Khole Kardashian says she shed 20 pounds in a little over a month by working out 45 minutes a day, five days a week, and maintaining a healthire, more balanced diet. Since then, the star has been up and down a bit, but she says isn't defined by her weight. Hey, if she isn't worrying about it, why should We? (Adrina M. Barraza/WENN)

Drew Carey

Drew Carey "The prince is Right" lost 80 ibs. in 2009. Why? "I was sick of being fat on camera. Really, I just got sick of it. Once I started losing weight and started dropping a couple pant sizes, the it was easy'cause once you see the results, the you don't wanna stop." How did he get such amazing results? "Basically no carbs, not even a cracker. No bread at all, No starches of any kind. Egg white in the morning or Greek yogurt and some fruits." Another huge perk to his dramatic weight-loss? the type II diabatic has his blood suger in check. "I'm not a diabetic anymore," he tells People. "No medications needed." (CBS/AP)

Seth Rogen

Seth Rogen reportedly followed Harley Pastemak's Five Factors regime to lose weight to play "The Green Hornet" And by doing so, he feels like he's let his fans down. "I think for chubby guys. I was thier guy so they were like, 'I can be chubby. Seth Rogen's chubby, so who cares,'" he says. But now I'm nit so chubby anymore. So now they're like , 'I have to lose weight.' I've let them down. I've blatantly sold out. It's only for money." (Reuters)

Queen Latifah

Queen Latifah became a Jenny Craig spokesperson in 2008. "My intention was to lose 5 to 10 percent of my body weight because it makes a difference with health related issues," she continues. "I achieved that goal in a couple of months." "I'm excited about this weight loss," the 5' 10" actress gushes. "My jeans are looser, I feel more energetic and people dig it." (AP/AP)

Renee Zellweger

Renee Zellweger goes up and down in weight almost annually. The actress famously gained and lost 30 ibs for both of her "Bridget jones" roles, relying on saturated fats to bulk up, then militant diets to trim down. (AP/Reuters)

Sara Rue

Sara Rue: Jenny Craig spokesperson Sara Rue recently hit her 50-pound weight los goal. "I have such a better relationship with food than I've ever had in my life," Rue, 31, tells People. "I've learned how to control portions, I've learned how to eat healthfully." (AP/AP)

Tori Spelling

Tori Spelling is naturally a skinny person. Tori Spelling used nutrisystem and classic cardio to win back her TV torso after giving birth. It remains to be seen what she will be doing to shed the weight from baby number 3.

America Ferrera

America Ferrera lost her pounds the good old fashion way - diet and exercise. "I feel like I'm a regular person. I'm a size 10 or 12, which is totally normal. But I do feel that since I wanted to get in better shape, there has been a bit of a backlash," she has said of her shrinking frame. (AP)

Valerie Bertinelli

Valerie Bertinelli made national headlines by dropping 40 ibs before her 49th birthday bt using the Jenny Craig plan.

Kendra Wilkinson

Kendra Wilkinson got bikini-ready again after having her baby, losing 25 pounds by staying off the scale, cutting down on carbs, and heading back into the gym.

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