See all the celebrities on the Billboard Music Awards red carpet!

<div class="meta image-caption"><div class="origin-logo origin-image ap"><span>AP</span></div><span class="caption-text">Liam Payne, from left, Louis Tomlinson, Niall Horan, and Harry Styles of the musical group One Direction arrive at the Billboard Music Awards. (AP)</span></div>
Check out all the musicians and celebrities arriving at the MGM Grand Garden Arena in Las Vegas for the 2015 Billboard Music Awards.
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