See which stars made head-turning transformations
Carrie Underwood - Before
Idol's season 5 champ admits that she's long struggled with the battle of the bulge. "Once I got out of high school I packed on about 10 pounds, and once I was on Idol, I packed on another 10 pounds," Underwood has said. "I'm a little person, I'm 5-foot-3, and I was about 130," she estimates.