Check out our slideshow of stars like Jonah Hill who've achieved explosive new looks.

Jonah Hill used to be the overweight comedic sidekick. Now he's a serious, Oscar-nominated actor with a whole, new look.

Jennifer Hudson got cast as Effie in Dreamgirls both for her big voice and plus-size curves. Now look at her!

Check out our slideshow of these and other stars who've gone from doughy to dynamite here.