Katy Perry has released a lyric video to her next single, Birthday. The peppy, upbeat, sexy little tune is def one of the highlights of her album Prism. It was written by Perry, Bonnie McKee, Max Martin, Dr. Luke and Cirkut. That's a lot of fingers in the pie, if you will. In the lyric video, Katy prepares all sorts of sweets for the object of her affection -- or CONfection, if you will. See what I did there? And yes, that is Katy and her sister on the single's artwork from a childhood birthday party. Since the song is actually pretty sexual, is it creepy to put a picture of your sister on the artwork? Am I over thinking this? Okay. I'll shut up. Enjoy the perfectly delightful Birthday below. Katy, don't fuck this one up with another eyesore of a video. Thanks.