LAS VEGAS, NV - SEPTEMBER 21: Rihanna performs onstage during the 2012 iHeartRadio Music Festival at MGM Grand Garden Arena on September 21, 2012 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)
LAS VEGAS, NV - SEPTEMBER 21: Rihanna performs onstage during the 2012 iHeartRadio Music Festival at MGM Grand Garden Arena on September 21, 2012 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)