Billboard Music Awards 2015

Jennifer Lopez attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Estelle

Musician Estelle attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

50 Cent

Rapper 50 Cent attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Taylor Swift

Taylor Swift attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Chrissy Teigen

Host Chrissy Teigen speaks onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Lia Marie Johnson and Trevor Moran

Actress Lia Marie Johnson (L) and singer Trevor Moran attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Danica McKellar

Actress Danica McKellar speaks onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Mariah Carey

Mariah Carey performs onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Celine Dion

Singer Celine Dion poses in the press room during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Mariah Carey

Mariah Carey attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Pitbull and Chris Brown

Pitbull (L) and Chris Brown perform onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Rita Ora

Rita Ora attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Bonnie McKee

Singer-songwriter Bonnie McKee attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Jennette McCurdy

Actress Jennette McCurdy attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Kerri Kasem

Radio host Kerri Kasem attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Billboard Music Awards

Miss America 2015 Kira Kazantsev (L) and musician Pete Wentz of Fall Out Boy speak onstage duringthe 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Ed Sheeran

Ed Sheeran performs onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Meghan Trainor

Meghan Trainor accepts the Top Hot 100 Song award for "All About That Bass" onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

One Direction

Singers Liam Payne, Louis Tomlinson, Niall Horan, and Harry Styles of One Direction attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Little Big Town

Singer Kimberly Schlapman of Little Big Town performs onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Nicki Minaj

Nicki Minaj performs onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Hozier

Hozier poses in the press room at the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Jennifer Lopez

Jennifer Lopez attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Nick Young and Iggy Azalea

Professional basketball player Nick Young and Iggy Azalea attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Britney Spears

Singer Britney Spears and Charlie Ebersol attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Chrissy Teigen and John Legend

Model Chrissy Teigen and singer songwriter John Legend attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Taylor Swift

Taylor Swift poses in the press room with her eight awards at the Billboard Music Awards the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Meghan Trainor

Meghan Trainor poses in the press room during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Serayah

Actress Serayah attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Wiz Khalifa

Wiz Khalifa attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Kylie Jenner

Kylie Jenner attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Kendall Jenner

Kendall Jenner attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Taraji P. Henson

Taraji P. Henson attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Simple Minds

Singer James Kerr of Simple Minds performs onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Hailee Steinfeld

Hailee Steinfeld attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Tracee Ellis Ross

Tracee Ellis Ross attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Little Big Town

Musicians Philip Sweet, Kimberly Schlapman, Karen Fairchild, and Jimi Westbrook of the country music group Little Big Town attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Imagine Dragons

Musicians Dan Reynolds, Ben McKee, Wayne Sermon, and Daniel Platzman of Imagine Dragons attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Fall Out Boy

Musicians Andy Hurley, Peter Wentz, Patrick Stump and Joe Trohman of Fall Out Boy attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

David Lee Roth

David Lee Roth attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Zendaya

Zendaya attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Kelly Clarkson

Kelly Clarkson performs onstage during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Billboard Music Awards

Model Martha Hunt attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Billboard Music Awards

Host Ludacris attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Billboard Music Awards

Singer Charli XCX attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.

Idina Menzel

Actress-singer Idina Menzel attends the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas.