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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Lady Gaga emerges at the iHeartRadio music festival
The pop superstar's set list included "Bad Romance", "Judas", "Alejandro", "Just Dance", "Poker Face", "Born This Way", "Telephone" and an emotional version of "Hair", which she dedicated to Jamey Rodemeyer, a 14-year-old fan who committed suicide last week due to bullying.