8. Demi Moore - G.I. Jane (1997)
Demi Moore was America's sweetheart in the late 80's, going from St. Elmo's Fire to About Last Night, then following up those films with Ghost and A Few Good Men. Then she awesomely starred in Indecent Proposal and Striptease, gaining some more notoriety and a ton more money. In 1997, Moore made G.I. Jane, the story of a female soldier who attempts to integrate into the all-male Navy. For the role, Demi Moore underwent rigorous military training and a high-protein diet in order to play the role of Lieutenant Jordan O'Neil. In addition to getting ripped, Moore also shaved off her hair, making the beautiful actress nearly unrecognizable.