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14 Celebrity Slim Downs — Before & After!

It’s no secret that Christina Aguilera had been battling her weight over the past couple years. That all changed this summer when the returning Voice judge took the stage at an NBC press event and proved to the world that you can in fact turn back the clock. Thanks to hard work and exercise the singer looks the way she did 10 years ago! For a little more health and fitness inspiration, see which other stars decided to put their health first and why, and find out which wellness plan that worked for them.

  • Christina Aguilera, BEFORE 1 of 29
    40th Annual American Music Awards - Arrivals

    After her divorce the singer steadily put on weight, and let's just say the media was not at all kind about it. In 2011, VH1 called a particularly snug leotard-and-fishnets look a "new low," and a blog on the network's website appealed to her stylists to change course. Last fall, fellow Voice judge Adam Levine defended his pal on Ellen saying, "No one should bother or haggle her about her weight or anything that she does or says. So, that's it. That's how I feel about it."

  • Christina Aguilera, AFTER 2 of 29
    Christina Aguilera at TIME 100 Gala, TIME'S 100 Most Influential People In The World at Jazz at Lincoln Center in New York City

    Is that a Genie in a Bottle? By April of this year, the 32-year-old star let the world know she was shrinking. By July, she looked back to her Xtina self. "I've known Christina since she was 15 or 16," Carson Daly said. "(Seeing her this weekend) it's almost like a time machine ... It was 1999 all over again."

     

  • Snooki, BEFORE 3 of 29
    Nicole 'Snooki' Polizzi dons some shades as she makes an appearance for Revolution Eyewear in New York

    The Jersey Shore wild child -- or should we say wild cat? -- was more interested in partying and tanning than cultivating a healthy lifestyle.

  • Snooki, AFTER 4 of 29
    Nicole 'Snooki' Polizzi hosts 'Bridezillas' Wedding Cake Eating Contest at Madison Square Garden in New York City

    Ironically, it took her first pregnancy with Baby Lorenzo to inspire Snooki's newfound love of fitness. She began an intense workout regimen to lose her baby weight. Now, 40 pounds lighter, she is a lithesome 96 pounds. For those who think she's gone too far in the other direction, the new mom has this to say, "I'm the size of a fifth grader. I'm supposed to be small!" 

  • Alec Baldwin, BEFORE 5 of 29
    A cheerful Alec Baldwin speaks to fans outside a Screen Actors Guild Awards after party at Spago in Beverly Hills

    At the Sag Awards in 2011, where he picked up his 5th nod for Outstanding Performance by a Male Actor for 30 Rock, it was clear that the real life Jack Donaghy had put on some pounds. 

  • Alec Baldwin, AFTER 6 of 29
    Alec Baldwin and wife Hilaria seen attend the premiere of 'Blue Jasmine' in New York City

    The secret to his new slim figure? One word: Hilaria. When Alec and his yoga teacher wife began dating in May of 2011, he cut sugar from his diet and took up spinning and Pilates. By the time they married last July, he looked like an entirely different Baldwin brother. 

  • Jordin Sparks, BEFORE 7 of 29
    Jordin before

    The Idol alum always looked stunning. Here at the 2009 VH1 Divas concert her lace dress accentuates her curves. 

  • Jordin Sparks, AFTER 8 of 29
    Jordin Sparks attends 2013 BET Awards at Nokia Plaza L.A. LIVE in Los Angeles

    At the BET Awards in June of this year, Jordin showed off her 50-pound weight loss. Her method? Hard work. She would hike in the morning, then head to her trainer, then end the day with a Latin dance fitness class. 

  • Kelly Clarkson, BEFORE 9 of 29
    ***EXCLUSIVE***American Idol's Kelly Clarkson performs at Utah Valley University in Orem, Utah

    During her career the Grammy-winner's weight has fluctuated considerably. Kelly told Self magazine, "My happy weight changes. Sometimes I eat more; sometimes I play more. I'll be different sizes all the time." Meanwhile, the magazine photoshopped the singer down a few sizes on their cover. 

  • Kelly Clarkson, AFTER 10 of 29
    Kelly Clarkson looks bright and bubbly as she leaves the BBC Radio 1 studios in London

    These days Kelly is looking fitter, and she has one tried and true message for shedding the pounds: falling in love! She got engaged to Brandon Blackstock last December. A few months later she told Cosmopolitan, "One magazine said I lost 40 pounds -- that's a small child, by the way. I lost 18 pounds. And I think that happens when you fall in love or date someone. If I'm going to be kissing or messing around, I gotta look good."

  • Perez Hilton, BEFORE 11 of 29
    *EXCLUSIVE* Out and about! Perez Hilton takes a stroll in West Hollywood

    This is pretty much how I pictured the blogger-extraordinaire, until recently when I found out a major metamorphosis had occurred. 

  • Perez Hilton, AFTER 12 of 29
    Perez Hilton attends art opening for Tyler Shields at the Guy Hepner space in Beverly Hills

    Pretty amazing, right? This complete makeover began in 2008. Perez lost over 70 pounds the old-fashioned way with healthy eating (he uses a delivery service) and intense workouts 7 days a week. His fitness idols? David Beckham and Zac Efron. Might as well aim high. 

  • Kelly Osbourne, BEFORE 13 of 29
    **UK OUT** Kelly Osbourne leaves the i-D Magazine party in London

    The Fashion Police co-host had been to rehab a whopping 7 times. In her early 20's, critics and other celebs -- including Christina Aguilera, according to Kelly -- called her fat. 

  • Kelly Osbourne, AFTER 14 of 29
    Kelly Osbourne attends CW Network's 2013 Young Hollywood Awards presented by Crest 3D White and SodaStream held at the Broad Stage in Santa Monica

    Today, she's 70 pounds lighter than she used to be and has completely revamped her eating habits. She credits her stint on Dancing With The Stars for introducing her to exercise and nutrition. Now, her vegan chef fiancé, Matthew Mosshart, makes her nutritious meals. 

  • Jennifer Hudson, BEFORE 15 of 29
    Jennifer Hudson arrives for the premiere of "Dreamgirls"

    The year Jennifer won Best Supporting Actress at the Oscars for her Dreamgirls performance, a reporter on the red carpet asked her what it was like to be a bigger actress in Hollywood. "I was in complete shock," she says, "Where I come from, Chicago, I was a normal-size girl. She was talking to be about being a bigger girl and I was like: 'I am?'"

  • Jennifer Hudson, AFTER 16 of 29
    Super slimmed down star Jennifer Hudson films a Weight Watcher commercial in Los Angeles

    Just days after her son was born, Jennifer decided she was going to focus on a healthier lifestyle. A year later, Weight Watchers asked her to be a spokesperson, and by 2010 she had lost 80 pounds and gone from a size 16 to a size 6. Since then she's inspired no less than 75 friends and family members to do the same and they've lost nearly 2,000 pounds collectively. 

     

  • Jack Osbourne, BEFORE 17 of 29
    Jack Osbourne rocks up to My Studio with cellophane covering the new tattoo on his chest

    The Fuse News co-host and son of legendary addict, Ozzy Osbourne, was mostly known for his self-destructive partying ways and visit to rehab. 

  • Jack Osbourne, AFTER 18 of 29
    Jack Osbourne  at the Cops4Causes 9/11 Inaugural at Pink Taco in Los Angeles

    When Jack was diagnosed with MS it was his "ah-ha" moment. He took control of his health and lost 70 pounds by following the Paleo diet. He told Dr. Oz that he starts off his day with a liquid breakfast -- a berry smoothie -- and even tried controversial HCG injections (human chorionic gonadotropin) to suppress hunger. 

  • Jennie Garth, BEFORE 19 of 29
    Jennie Garth at the Los Angeles premiere of the HBO Film "Grey Gardens"

    When the mom-of-three did Dancing With the Stars in 2007 she dropped a ton of weight due to the intense training, then gradually regained her normal, slim shape. 

  • Jennie Garth, AFTER 20 of 29
    'Beverly Hills 90210' veteran Jennie Garth is seen leaving a party held at the Montage hotel in a sexy revealing gold top in Beverly Hills

    When Jennie, 40, split from Peter Facinelli, her husband of 11 years, she shed 40 pounds and got close to the scary side of skinny. Since then she admits she keeps up a strict "maintenance" diet to keep the pounds from coming back. Her fitness plan includes 90-minute sessions at Cold Iron Barbell gym.

  • Jonah Hill, BEFORE 21 of 29
    "Superbad" star Jonah Hill, wearing a backpack, leaves Matsuhisa after meeting up with friends for dinner

    This is pretty much what Jonah looked like when he broke into the ranks of Hollywood superstardom in 2007's Superbad. I would call him an apple shape.

  • Jonah Hill, AFTER 22 of 29
    A super slim Jonah Hill greets fans at the  'Comic Con' in San Diego

    Almost unrecognizable! Jonah lost nearly half of himself -- okay, 40 pounds -- by eating... a lot of Japanese food. Or so he said. He also said that his motivation was simply to be considered for more adult roles. Guess it worked -- he was nominated for an Oscar for Moneyball

  • Jonah Hill, NOW 23 of 29
    Jonah Hill relaxes with girlfriend Alexandra Hoffman after a super weird afternoon watching a woman give birth in a public New York Park

    And sometimes it's hard to keep it off. Slowly, little by little, Jonah has returned to his original portly self. His main temptation: Beer. "It's so annoying because if I don't drink beer I get really thin, and then when I drink beer I get a little bigger," he told an Australian radio show. "You should try beer, it's really good."

  • Melissa Joan Hart, BEFORE 24 of 29
    "The Incredible Burt Wonderstone" Los Angeles Premiere - Arrivals

    Melissa, 37, gained 60 pounds while pregnant with Tucker, her third child.  

  • Melissa Joan Hart, AFTER 25 of 29
    "Despicable Me 2" Los Angeles Premiere - Arrivals

    That's one sexy mama. At the Monsters University premiere in June, Melissa showed off her new bod. She lost 30 pounds with Nutrisystem and training sessions 3 times a week. 

  • Janet Jackson, BEFORE 26 of 29
    Is Janet Jacksons fitness regime beginning to pay off

    The singer readily admits that she is an "emotional eater" which many people can relate to. She told Access Hollywood, "I eat when I stress, when I'm down, when I'm in a state of not being in the greatest space. And that's my place of comfort that I go to for that moment. Then I kick myself after doing it."

  • Janet Jackson, AFTER 27 of 29
    Janet Jackson at the Amfar AIDS benefit gala at the Cannes Film Festival

    These days, at 47, Janet is looking fierce. She started working with NutriSystem in 2012. She doesn't keep track of her weight with a scale but prefers to track how she feels. Occasionally, she even indulges in her must-have treat: Caramel apples!

  • Kirstie Alley, BEFORE 28 of 29
    Kirstie Alley takes the family for some sushi at Katsuya whilst being filmed by a camera crew for a documentary

    Kirstie's dramatic weight fluctuations have become her trademark -- remember her big bathing suit reveal on Oprah? She even created a faux-reality show Fat Actress which aired on Showtime for one season in 2005. 

  • Kirstie Alley, AFTER 29 of 29
    Kirstie Alley carries a funky purse at Maksim Chmerkovskiy's Ballroom Birthday Bash at the Hammerstein Ballroom in NYC

    Kirstie can thank Maksim Chmerkovskiy for her most recent weight drop. Her DWTS partner for two seasons put her through the paces which helped her shed 100 pounds and 10 dress sizes. 

 

Images courtesy of Pacific Coast News and PRPhoto

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