A holographic image of Michael Jackson performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Kevin Winter/Billboard Awards 2014/Getty Images for DCP)

Singer Shakira performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Singer Shakira performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Kevin Mazur/Billboard Awards 2014/WireImage)

Singer Shakira performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Kevin Mazur/Billboard Awards 2014/WireImage)

Singer Shakira performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Kevin Mazur/Billboard Awards 2014/WireImage)

Miranda Lambert (L) and Carrie Underwood perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Miranda Lambert (L) and Carrie Underwood perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Miranda Lambert (L) and Carrie Underwood perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Recording artist Lorde performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Christopher Polk/Billboard Awards 2014/Getty Images for DCP)

Rapper Snoop Dogg (L) and singer Jason Derulo perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Kevin Mazur/Billboard Awards 2014/WireImage)

Singer Jason Derulo (center) performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Singer Jason Derulo performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Singer Jason Derulo (center) performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Jennifer Lopez performs onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

(L-R) Guitarist Michael Clifford, singer Luke Hemmings and guitarist Calum Hood of 5 Seconds of Summer rehearse onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 16, 2014 in Las Vegas, Nevada. (Photo by Kevin Winter/Billboard Awards 2014/Getty Images for DCP)

Ricky Martin performs onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Ricky Martin performs onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Ricky Martin performs onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Iggy Azalea (L) and Ariana Grande perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Iggy Azalea (L) and Ariana Grande perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Dan Reynolds, Ben McKee, Daniel Platzman and Wayne “Wing” Sermon of Imagine Dragons perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Charli XCX (L) and Iggy Azalea perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Charli XCX (L) and Iggy Azalea perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Recording artist Ariana Grande performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Recording artist Ariana Grande performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Recording artist Ariana Grande performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Jennifer Lopez and Pitbull perform onstage during the 2014 Billboard Music Awards held at MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)

Recording artist Claudia Leitte performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

(L-R) Singer/actress Jennifer Lopez, recording artist Pitbull and singer Claudia Leitte perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Recording artist Pitbull performs onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

(L-R) Singer/actress Jennifer Lopez, recording artist Pitbull and singer Claudia Leitte perform onstage during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)