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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Kelly Clarkson gives the crowd their money's worth
The former "American Idol" contestant showed up to perform songs from her upcoming fifth studio album, "Stronger".
While we're on topic, whatever happened to Justin Guarini?
Photo Credit: AP Photo/Chris Pizzello