Brooke Shields has been famous for a long, long time, but in her early career, she was famous for being a sexy teenager. 

We see sexy teens all the time now in Hollywood - Selena Gomez, Britney Spears back in the day, but Brooke took sexy to a whole nuther level.  Check out some classic clips from Brooke:

And there's this one:

And of course, the very inappropriate 'Pretty Baby':

Happy Birthday Brooke!