Prism

Since her 2008 launch as One of the Boys, Katy Perry has been evolving.
The flippant sexual experimentation of “I Kissed A Girl” and the relationship rollercoaster that was “Hot N Cold” gave way to full-blown Willy Wonka status on 2010’s Teenage Dream, a candy-coated Pleasure Island featuring party anthems “TGIF” and “California Gurls.”