Happy birthday, Katy! The singer turns 27 today so to celebrate we're checking out the best of her wacky nail looks — thanks to her Twitter account, we’re given close-up access of her intricate designs. The popstar constantly switches up her style, rocking everything from blindingly bright disco ball-inspired nails to her husband Russell Brand’s face! Most recently she's turned to The Smurfs for inspiration — it’s little wonder OPI decided to collaborate with her! See all her must-have manis up close!