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)