Ethan Miller/Getty Images
Singer Justin Bieber performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas. Bieber was booed by the audience during his performance.
Jason Merritt/Getty Images
Singer/actress Miley Cyrus arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Singer Psy arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Singer Shania Twain arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Chad Kroeger of Nickleback and Avril Lavigne arrive at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Retired boxer Mike Tyson arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Castmembers of Ka arrive at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Singer Carly Rae Jepsen arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
SkyBlu of LMFAO arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Chris Brown performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Taylor Swift performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas. Swift won the most awards out of any performer that night, taking home eight trophies.
Ethan Miller/Getty Images
Recording artist Nicki Minaj performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Z-LaLa arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Actress Alyssa Milano and David Bugliari arrive at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Bruno Mars performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
DJ David Guetta performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Rapper Nicki Minaj and rapper Lil Wayne perform during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Jennifer Lopez performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Donna Grantis, Prince and Ida Nielson perform during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Madonna accepts the award for touring artist of the year with musician will.i.am during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Actress Chloe Grace Moretz speaks during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Musician Ed Sheeran performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Miguel performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Pitbull, Morten Harket of A-ha and Christina Aguilera perform during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Selena Gomez performs during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Presenters Brian Kelley and Tyler Hubbard of Florida Georgia Line speak during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singers Caroline Hjelt and Aino Jawo of Icona Pop perform during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Actress/singer Ariana Grande arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Singer Jennifer Nettles arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Singer Nicki Minaj arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Host Tracy Morgan speaks during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Celine Dion poses in the press room during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Kimberly Perry and musician Neil Perry of The Band Perry perform during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ethan Miller/Getty Images
Singer Miley Cyrus speaks during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Actress Jenny McCarthy arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
David Becker/Getty Images
Jennifer Lopez and Casper Smart arrive at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Wiz Khalifa and Amber Rose arrive at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Madonna poses in the press room during the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Jason Merritt/Getty Images
Singer Ke$ha arrives at the 2013 Billboard Music Awards on May 19, 2013, in Las Vegas.
Ken Lombardi is an entertainment reporter for CBS News. He has interviewed over 300 celebrities, including Clint Eastwood, Oprah Winfrey and Tom Hanks.