Angelina Jolie is celebrating her 44th birthday, but you wouldn't be able to tell just by looking at her. With more than two decades in the spotlight, we've watched the actress change through the years and shut it down in countless badass movie roles. In her personal life, we've fawned over her famous romances and her sweetest moments with her kids. In all this time, though, one thing has surely stayed the same: Angelina's status as one of the sexiest stars in Hollywood. We've got the pictures to prove our point.