New Year, New You in 2014

Hollywood's Weight-Loss Winners

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

JESSICA SIMPSON

Following daughter Maxwell's arrival in May, the Simpson found new inspiration to ditch the baby weight. "I want to be as healthy as I can because I'm a mom now," the Weight Watchers spokesperson told Katie Couric in September, showing off her 40-lb. weight loss. "For me, I really want to do something that is a lifestyle, because in the past, I've been known to yo-yo diet."