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

Liam Payne, from left, Louis Tomlinson, Niall Horan, and Harry Styles of the musical group One Direction arrive at the Billboard Music Awards. (AP)

Britney Spears arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Nick Young, left, and Iggy Azalea arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Olivia Culpo, left, and Nick Jonas arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Rita Ora arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Mariah Carey arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Taylor Swift arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Chrissy Teigen, left, and John Legend arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

The musical group Fifth Harmony arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Jennifer Lopez arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

50 Cent arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Meghan Trainor arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Ludacris arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Calvin Harris arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Serayah arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Wayne Newton, left, and Kathleen McCrone arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Wiz Khalifa arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Kylie Jenner arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Kendall Jenner arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Hailee Steinfeld arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Panio Gianopoulos, left, and Molly Ringwald arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Ed Sheeran arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Taraji P. Henson arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Tracee Ellis Ross arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Andy Hurley, from left, Pete Wentz, Patrick Stump, and Joe Trohman of the musical group Fall Out Boy arrive at the Billboard Music Awards. (AP)

Michael Alvarado, left, and Carissa Alvarado arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Lindsey Stirling arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Natalie La Rose arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Estelle arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Prince Royce arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Stefanie Scott arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Kira Kazantsev arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Dan Reynolds, from left, Ben McKee, Daniel Sermon, and Daniel Platzman of the musical group Imagine Dragons arrive at the Billboard Music Awards. (AP)

Laverne Cox arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Brittney-Marie Cole, from left, Brian Kelley and Tyler Hubbard of the musical group Florida Georgia Line, and Hayley Stommel arrive at the Billboard Music Awards. (AP)

Phillip Sweet, from left, Kimberly Schlapman, Karen Fairchild, and Jimi Westbrook of the musical group Little Big Town arrive at the Billboard Music Awards. (AP)

Brantley Gilbert, left, and Amber Cochran arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Danica McKellar arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Zendaya arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Liz Hernandez arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Giuliana Rancic arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Chelsea Briggs arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Bonnie McKee arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Bailee Madison arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Keltie Knight arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Jeannie Mai arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)

Jennette McCurdy arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (AP)