Rihanna, Green Day, Usher and more rock Vegas at iHeart Radio festival
Las Vegas' iHeart Radio Festival brought some of music biggest stars to Sin City on Friday night. Among the top performers were Rihanna, Green Day, Usher, Lil Wayne, No Doubt, Bon Jovi, Jason Aldean and more. Even Korean sensation Psy brought "Gangnam Style" to the event.
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