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LAS VEGAS, NV - MAY 17: Recording artist Charli XCX attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Michael Buckner/BMA2015/Getty Images for dcp)

LAS VEGAS, NV - MAY 17: Recording artist Charli XCX attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada.  (Photo by Michael Buckner/BMA2015/Getty Images for dcp)