57. Katy Perry

Katy Perry spent much of the last year on tour to support her album Teenage Dream. The breakneck schedule didn't offer her much time off, and sadly, Katy's marriage to Russell Brand was subject to rumors of trouble. In December 2011, the stories were confirmed when Russell filed for divorce. Katy bounced back by mid-2012, and has been linked to a new love, Florence + the Machine's Robert Ackroyd. She's now making the press rounds to chat up her behind-the-scenes movie, Part of Me.

Katy's also presiding over a product empire that includes a Barbie in her image and the video game, The Sims 3: Katy Perry's Sweet Treats. Additionally, she voiced a role in the July 2011 picture The Smurfs. Katy received many honors for her work. In 2012, she picked up the Billboard Award's Billboard Spotlight honor and video of the year at the MTV VMAs in 2011 for "Firework."

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