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Kelly has dropped 50 pounds over the past three years, hitting her highest weight of 160 in 2007. But the gorgeous starlet, who now weighs 112 pounds, admits it wasn’t just crash diets that kept the weight off!

Kelly Osbourne has a lot to be happy for, but one is definitely her newly-svelte body! The world began to take notice of the 25-year-old’s dramatic weight loss when she appeared on Dancing with the Stars in 2009. Once a size 14, Kelly proudly tells Us Magazine that she is now barely a size 2! “I’m smaller than a sample size!” she crows.

Kelly, who weighs 112 pounds, tells the mag that she didn’t cut corners when trying to achieve her ideal weight: ”There is no secret. It’s the old-fashioned way of making a commitment to yourself and waking up every day and doing it.”

The once avid believer in the Bar Method (a mix of pilates and ballet), now opts for three weekly hourlong workouts, and 30-minute treadmill sessions.

“She wanted to maintain and see how she could progress, see what else her body was capable of,” says her trainer Sarah Hagaman.

Kelly, who is the newest addition to E!’s Fashion Police, reveals that making healthy choices when it came to her meals made all the difference. Instead of snacking on her favorite Mrs. Field’s cookies, Kelly now prefers turkey burgers, salads, and even craves carrots!

“I don’t eat junk food. I don’t have it in my house anymore,” she says. “I’m more inclined to go for a bag of carrots now than a bag of chips. I never thought I would turn into that girl, but I have!”

But the star admits that even though the process “wasn’t overnight,” she’s learned more about herself along the way, and for that she is thankful.

“I gained a level of confidence. It’s like this feeling disappeared that I had carried around with me for so long, and finally I was like, forget it,” she says. “It’s not what life’s about.”

— Chloe Melas