Photos:: Billboard Music Awards 2015 | Red carpet arrivals

Singers Liam Payne, Louis Tomlinson, Niall Horan and Harry Styles of One Direction.

Prince Royce, Miss America 2015 Kira Kazantsev and Lindsey Stirling

NBA basketball player Nick Young and Iggy Azalea

Britney Spears and Charlie Ebersol

Idina Menzel, left, Laverne Cox and Estelle

Singer Rita Ora

Mariah Carey

Ed Sheeran

Taylor Swift

Singer Nick Jonas and model Olivia Culpo

Host Chrissy Teigen and musician John Legend

Curtis “50 Cent” Jackson III

Lauren Jauregui, left, Ally Brooke, Normani Hamilton, Dinah-Jane Hansen and Camila Cabello of the musical group Fifth Harmony.

Meghan Trainor

Jennifer Lopez

Rapper Wiz Khalifa

Calvin Harris

Phillip Sweet, left, Kimberly Schlapman, Karen Fairchild and Jimi Westbrook of the musical group Little Big Town arrive at the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas on May 17, 2015.

Avi Kaplan, left, Scott Hoying, Mitch Grassi and Kevin Olusola of the musical group Pentatonix.

David Lee Roth, left, Giuliana Rancic and Andy Grammer.

Andy Hurley, left, Pete Wentz, Patrick Stump and Joe Trohman of the musical group Fall Out Boy.

Mark Pellizzer, left, Ben Spivak, Nasri and Alex Tanas of the musical group Magic!.

Danica McKellar, left, Bonnie McKee and Kerri Kasem

Dan Reynolds, left, Ben McKee, Daniel Sermon and Daniel Platzman of the musical group Imagine Dragons.

Brian Kelley, left, and Tyler Hubbard of the musical group Florida Georgia Line.

Charli XCX

Bailee Madison, left, Zendaya and Jennette McCurdy