Lady Gaga, Nicki Minaj, J. Lo, Usher among bevy of A-listers to turn out for the iHeartRadio music festival in Las Vegas
Fergie, Carrie Underwood, Jay-Z, Alicia Keys also burn up the stage
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Steven Tyler squats like a champ at the iHeartRadio music festival
The "American Idol" judge is also in a band called Aerosmith. It's been a rough climb, but I think they're finally poised for a breakthrough.