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10. Mena Suvari
Breakout age: 15
Nymphet nature: Remember Mena in "American Pie"? Yeah, we don't either. Probably because she played the prudish goody-two-shoes who dumped Oz because of his bad rep. Now, do you remember Suvari as teenage rose-covered seductress Angela Hayes in "American Beauty"? Of course you do. And judging from this photo of her at 19, she was more coquette than choir girl in real life, too.