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LAS VEGAS, NV - MAY 17: (L-R) Singers Liam Payne, Louis Tomlinson, Niall Hora and Harry Styles of One Direction arrive at the 2015 Billboard Music Awards at the MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Jeffrey Mayer/WireImage)

LAS VEGAS, NV - MAY 17: (L-R) Singers Liam Payne, Louis Tomlinson, Niall Hora and Harry Styles of One Direction arrive at the 2015 Billboard Music Awards at the MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Jeffrey Mayer/WireImage)