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LAS VEGAS, NV - SEPTEMBER 22: Musician Prince (R) and singer Mary J. Blige perform onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 22, 2012 in Las Vegas, Nevada. (Photo by Michael Kovac/Getty Images for Clear Channel)

LAS VEGAS, NV - SEPTEMBER 22:  Musician Prince (R) and singer Mary J. Blige perform onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 22, 2012 in Las Vegas, Nevada.  (Photo by Michael Kovac/Getty Images for Clear Channel)