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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Jay-Z and Alicia Keys reunite at the iHeartRadio music festival
The two artists performed their 2009 hit "Empire State of Mind".
Keys also debuted her new song "A Place of My Own" from her upcoming fifth album. Her last effort, 2009's "The Element of Freedom", sold over 1.3 million copies in the U.S.