Sure, she's the daughter of Aerosmith's Steven Tyler, and stars with Adam Sandler in Reign Over Me. But acting and rock 'n' roll roots aside, the best thing about Liv is her positive body image.

"If I worked out three hours a day, every day, I'd be such a boring person," she tells Glamour. "I've always been a big girl -- I'm 5'10", with a broad back and wide shoulders -- and I have always felt pretty comfy in my skin, no matter how big or how small my bum is at the time. But it's not how I measure my happiness. I just want to be myself -- I can't try and be somebody else. Beauty is not defined by the size of your jeans."

Photo: Devaney/WireImage