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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Jennifer Lopez is a whirling dervish on stage
The "American Idol" host is now trying to revive her own music career.
"All I Have", "I'm Real" and "Get Right" were among the songs lip-synced...err, performed by Lopez.
Photo Credit: AP Photo/Chris Pizzello