20. Jessica Alba in Into the Blue (2005)
There's really no surprise as to why, after she appeared in Into the Blue, Alba started being defined as a sex symbol, got included on lists like Maxim's Hot 100, and earned Sexiest Woman Alive in 2007 from FHM. In her mismatched bikini, Alba showed that being a sex symbol isn't all that she is. She athletically dove for treasure and beat up guys with a boat hook, letting tiger sharks finish her dirty work. Yeah, pretty bad ass for someone who just wanted to go snorkeling.