Ryan Seacrest announced the line-up for the 2012 iHeartRadio Music Festival Monday morning. The biggest live music event in radio history is back, and this year it's even bigger and better!
Watch the announcement:
Check out the list of performers who will take the stage at the MGM Grand Garden Arena in Las Vegas September 21-22 for the iHeartRadio Music Festival below!
Swedish House Mafia
Mary J. Blige