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Kelly Osbourne credits Dancing With the Stars pro Louis van Amstel with changing her eating habits. She lost 20 pounds while on the show, but when DWTS ended, Kelly broke from her diet and workout routine and started to gain weight again. Steal body-toning secrets from Dancing With the Stars pros
See her dramatic transformation from MTV darling to VH1 Diva!
Kelly Osbourne Weight Loss
Photos: Kelly Osbourne Then and Now