Who would have ever guessed Louis Stevens, the troublemaker from "Even Stevens," would transform into one of the biggest on-screen heartthrobs? We have to hand it to the casting directors (especially the ones from the Harry Potter series), who were able to pick these guys out at such a young age. Take a look at 7 of the most unexpected on-screen hotties, who started off their acting careers with some not-so-dreamy roles.