By Claire Connors

As the daughter of Sharon and Ozzy, and one of the stars of the iconic reality show The Osbournes, Kelly Osbourne has been taunted and criticized in the tabloids, not so much for her wild-child ways-or even her drug addiction-but for her weight. "I was called fat and ugly in the press almost my entire life," says the 26-year-old. "I understand that being judged by others comes with the territory, but it broke my heart and ruined my self-esteem. It sets you up to hate yourself in a huge way. I was so angry about the things people said about me. I truly believe it's the main reason I turned to Vicodin and ended up in rehab three times. I just hated myself."

Kelly Osbourne Weight Loss Revelation #1: "I'm an Emotional Eater"

In early 2009, Kelly Osbourne walked out of Oregon's Hazelden Alcohol and Drug Rehabilitation Center drug-free-but still dealing with major confidence issues. "I replaced the drugs with food and just got fatter and fatter," she says. "I'm an emotional eater. When I get upset, my diet goes out the window." It wasn't until she signed up for Dancing With the Stars six months later, she says, that she realized how bad her diet really was. "I'd fill up on French fries and pizza all day and wonder why I wasn't losing weight. In the very beginning, I kept getting sick during rehearsals because I was eating such terrible, fatty food and feeling so exhausted."

It was her dance partner, Louis van Amstel, who taught her about nutrition. "He made me eat turkey burgers and salads and explained to me that a high-protein, low-carb diet would keep me energized," she says. "Then I started losing weight and realized, 'Oh, it's true what they say: Diet and exercise really work!'"

Kelly lost 20 pounds during her stint on the show, but once she hung up her dancing shoes, the weight began to creep back on. "I put on 3 or 4 pounds, and I didn't like it one bit," she says. "I thought, 'Kelly, you've come this far, let's see what you can really do!' " Her mother, Sharon, whom Kelly calls her biggest inspiration, hooked her up with her trainer, Sarah Hagaman, and the three began working out together by taking long hikes a few times a week in the Hollywood Hills. After a month, Kelly was ready to hit the gym.

Kelly Osbourne Weight Loss Revelation #2: "I Stopped Hating the Way I Looked"

In the beginning, the hardest part wasn't the workout, it was seeing her reflection in the mirror. "I would look at myself and think, 'Ugh!' I was miserable. To get to the gym-when you already don't like yourself-is really hard. So I had to make it fun. I started wearing cute outfits and putting on a little bit of makeup. And as vain as it sounds, it really helped me because eventually I stopped hating the way I looked."

Now that she's committed to her routine, Kelly stays motivated by getting her friends to join her for workout classes. "My girlfriends and I just started doing plyometrics," she says. "It's a killer-it hurts so much. But when you walk out of there, you're like, 'I can't believe I just did that and my body looks this good.' "

Kelly Osbourne Weight Loss Revelation #3: "I've Finally Learned How to Do it Right"

Over the last nine months, Kelly's dropped another 30 pounds, bringing her weight loss to a total of 50. "I used to eat chips and cookies and drink soda all day long," she admits. "I had to start making better choices." She still sticks to her diet, but at 5'2" and 112 pounds, she doesn't want to lose any more weight-so she's added back in some of her old favorites. "I indulge with pizza and cheese-I love Brie-and have cookies sometimes," she admits. "But now, when I'm full? I stop eating! It may have taken me 26 years to figure it out, but I've finally learned how to do it right."

And all that crazy hard work has paid off-big time. "Ultimately, I'm really glad I lost the weight the way I did," says Kelly. "I never thought in a million years I'd be that healthy girl who wakes up every morning to exercise. After being called 'cherubic and chubby,' I'm rocking a bikini! I feel silly, but I think I'm going to cry. Being on the cover of SHAPE is the biggest victory I could ever hope for." Go behind the scenes of her covershoot in the video below.

Kelly appeared on the cover of SHAPE's December 2011 issue. In her exclusive interview, Kelly Osbourne revealed how she overcame her aversion to exercise and who convinced her to slim down without surgery. brightcove.createExperiences();

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