We've seen Katy Perry rocking a Crayola Box of fake hair recently in promotion of her delicious Teenage Dream LP—and the colors keep on flowing in Perry's recent Phil Knott photo shoot for The Guardian. The chameleon-like pop star goes through a personality disorder in these retro photos, switching from a black-haired siren, a green-coiffed bathing beauty and a red-headed flapper. (And does anyone else think blonde Katy Perry resembles Gwen Stefani circa Tragic Kingdom, or is that just us?) Flip through our gallery of the sweet-toothed singer becoming a real life rainbow. [Via Katy Perry.us.]