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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Carrie Underwood sings to the rafters at the iHeartRadio music festival
All three of the "American Idol" diva's albums have topped over 2 million in U.S. sales. In other words, she can totally afford those shoes.