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LAS VEGAS, NV - MAY 15: Singer Charli XCX performs during Rock in Rio USA at the MGM Resorts Festival Grounds on May 15, 2015 in Las Vegas, Nevada. (Photo by C Flanigan/FilmMagic)

LAS VEGAS, NV - MAY 15:  Singer Charli XCX performs during Rock in Rio USA at the MGM Resorts Festival Grounds on May 15, 2015 in Las Vegas, Nevada.  (Photo by C Flanigan/FilmMagic)