September 20, 2013 - Christopher Polk/Getty Images North America more pics like this »
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If you couldn't make it down to the desert for the iHeartRadio Music Festival Sept. 20-21, you're in luck. Here's 50 awesome pictures from the Sin City shows — including Miley Cyrus twerking, Ke$ha without pants, Robin Thicke losing a button, Katy Perry as a schoolgirl, and more...