15. Natalie Portman
Her wise-child debut at 11 as an assassin-in-training in The Professional had guys everywhere counting the days until Natalie turned 18. After reigning over the deeply un-sexy empire in three Star Wars flicks, Portman came of age as Closer's duplicitous stripper Alice and Garden State's Shins-loving life force.
Must-see movie: Closer
Turn-ons: Portman does a turn as Clive Owen's pink-wigged private dancer.