Look Great, Feel Good in 2013

Hollywood's Weight-Loss Winners

See which stars transformed themselves – Jessica Simpson! Jennie Garth! – with a whole new look and attitude


Along with a new man, Clarkson got a new look in 2012. "I do cardio. I run. I strength-train using my own body weight," she told Redbook, adding, "[I try] to be healthy and happy."

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