Hilary Duff

Hilary Duff admits she was too skinny in her teenage years because she had low self-esteem. "I got pretty skinny when I was between 17 and 19," Duff told Health magazine last year. "At the time I was starting to become aware of what people said about me and how I looked in pictures. I regret it because I don't think I was happy then." She credited her then-boyfriend, now-husband, Mike Comrie for helping uplift her self-esteem: "It really helps to have a partner that loves everything about you and makes you feel really beautiful." And now Duff is pregnant, so hopefully she'll learn to love and appreciate everything her body is capable of in new ways. [OMG Music]