27. Katy Perry
When everyone found out how hot the girl behind summer 2008's bi-curious anthem was, Katy Perry quickly became a sex icon. Not bad for a girl who grew up in a Christian household. After her multi-platinum selling album Teenage Dream broke records, it became clear that KP is one of our era's real pop stars. We took notice early and gave homegirl a cover in 2009.
DECADE ACHIEVEMENT: Breaking Michael Jackson's record for most number one hits off a single album with her total of six off Teenage Dream.