Billboard Music Awards Heat Up Sin City

Selena Gomez arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP) (AP2013)

LAS VEGAS, NV - MAY 19: Singer Jennifer Lopez arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) (2013 Getty Images)

Selena Gomez, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP) (THE ASSOCIATED PRESS2013)

Miguel performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP) (AP2013)

LAS VEGAS, NV - MAY 19: Recording artist Pitbull and singer Christina Aguilera perform onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) (2013 Getty Images)

Jennifer Lopez, third from left, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP) (AP2013)