Kate Bosworth had us hooked since Blue Crush and years later, it's safe to say we're still smitten. The cool girl continues to fly high on our radar thanks to her stylish appearances on the streets, parties, and the red carpet. Kate is never afraid to take fashion risks, wowing us with off-kilter choices like a skin-baring two-piece ensemble from Proenza Schouler to leggy minis. So in honor of Kate's birthday, we're showing you 15 of our favorite partywear looks of 2011. Believe us, you don't want to miss out.