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FILE - In a Sunday, May 22, 2016 file photo, Britney Spears performs at the Billboard Music Awards at the T-Mobile Arena, in Las Vegas. U2, Drake, Britney Spears and Sting will perform at the 2016 iHearRadio Music Festival in September during the two-day event at the T-Mobile Arena in Las Vegas on Sept. 23-24, iHeartMedia announced Monday, July 25, 2016. (Photo by Chris Pizzello/Invision/AP, File)