^^ "Birthday" is the definition of pop perfection. It's so well crafted. You can tell Max + Luke really gave it all to make the best pure pop song they could have made for PRISM with this one. It truly deserved becoming one of her classics like many of the TD era singles. Easily one of her very best. Luke even got his mates from SNL to play the instruments on it as you can see from the writing credits, forever one of my favorite Katy songs.
