Billboard Music Awards 2014

Carrie Underwood and Miranda Lambert attend the 2014 Billboard Music Awards on May 18, 2014, at the MGM Grand Garden Arena in Las Vegas.

Kendall & Kylie Jenner

Kendall and Kylie Jenner arrive for the 2014 Billboard Music Awards on May 18, 2014, at the MGM Grand Garden Arena in Las Vegas.

Jennifer Lopez & Casper Smart

Casper Smart and Jennifer Lopez attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Nicki Minaj

Nicki Minaj attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Lance Bass

Lance Bass attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Chrissy Teigen & John Legend

Chrissy Teigen and John Legend attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Lucy Hale

Lucy Hale attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Kesha

Kesha attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Andi Dorfman

"The Bachelorette" star Andi Dorfman attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Ricky Martin

Ricky Martin attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Shakira

Shakira attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Wiz Khalifa & Amber Rose

Wiz Khalifa and Amber Rose attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Kelly Rowland

Kelly Rowland attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

5 Seconds of Summer

Luke Hemmings, Ashton Irwin, Calum Hood and Michael Clifford of 5 Seconds of Summer attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Pete Wentz

Pete Wentz of Fall Out Boy attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Florida Georgia Line

Brian Kelley and Tyler Hubbard of Florida Georgia Line attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Josh Groban

Josh Groban attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Billy Ray Cyrus

Billy Ray Cyrus arrives for the 2014 Billboard Music Awards on May 18, 2014 at the MGM Grand Garden Arena in Las Vegas.

Jackie Jackson

Jackie Jackson attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Jordin Sparks

Jordin Sparks attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Ludacris

Host Ludacris speaks onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Jennifer Lopez, Pitbull & Claudia Leitte

Jennifer Lopez, Pitbull and Claudia Leitte perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Shania Twain

Shania Twain speaks onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Iggy Azalea & Ariana Grande

Iggy Azalea and Ariana Grande perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

5 Seconds of Summer

Michael Clifford, Luke Hemmings, and Calum Hood of 5 Seconds of Summer perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Ricky Martin

Ricky Martin performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Sarah Hyland & Lindsey Stirling

Sarah Hyland and violinist Lindsey Stirling speak onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Shakira

Shakira performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Miranda Lambert & Carrie Underwood

Miranda Lambert and Carrie Underwood perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Lucy Hale & Jack Antonoff

Lucy Hale and Jack Antonoff of the music group fun. speak onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Jennifer Lopez

Jennifer Lopez performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Jennifer Lopez

Jennifer Lopez speaks onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Snoop Dogg

Snoop Dogg speaks onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Lorde

Lorde performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Jason Derulo

Jason Derulo performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

2 Chainz

2 Chainz performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Luke Bryan & Florida Georgia Line

Luke Bryan, center, and Florida Georgia Line members Brian Kelley, left, and Tyler Hubbard perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Robin Thicke

Robin Thicke performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.

Imagine Dragons

Imagine Dragons performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014, in Las Vegas.