Before the stars took the stage at the 2012 Billboard Music Awards, in Las Vegas, on Sunday (May 20), our fashion editor, Gregory Dellicarpini Jr., stopped a few on the red carpet to talk fashion. Gregory shared style pointers with some of the best dressed of the night, including Miley Cyrus, Justin Bieber, The Wanted, Carly Rae Jepsen and more. Check out who wore what and why at the Billboard Music Awards.