37. Rihanna

After taking her time out of the spotlight, Rihanna rebounded with a rocking album, Rated R, and an edgy new look. She celebrated the New Year with her boyfriend, LA Dodger Matt Kemp, and kept the temperatures rising with a provocative GQ spread. Rihanna added to her awards collection, taking home a Grammy for her collaboration with Jay-Z on "Run This Town."

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