Ke$ha arrives at the 2014 Billboard Music Awards is Las Vegas. Pictures: Getty

Jennifer Lopez arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

Choreographer Casper Smart and singer Jennifer Lopez attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas, Nevada. Picture: Getty

Kendall Jenner arrives at the 2014 Billboard Music Awards. Pictures: Getty

Baby Kardashians Kendall Jenner and Kylie Jenner attend the 2014 Billboard Music Awards. Picture: Getty

Rapper Iggy Azalea attends the 2014 Billboard Music Awards. Picture: Getty

Kelly Rowlands arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

Miranda Lambert arrives at the 2014 Billboard Music Awards. Pictures: Getty

Shakira arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

Nicki Minaj arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

Rapper Wiz Khalifa and model Amber Rose attend the 2014 Billboard Music Awards. Picture: Getty

Singers Jordin Sparks and Jason Derulo attend the 2014 Billboard Music Awards. Picture: Getty

Ricky Martin arrives for the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

Carrie Underwood arrives at the 2014 Billboard Music Awards. Pictures: Getty

Sarah Hyland arrives at the 2014 Billboard Music Awards is Las Vegas. Pictures: Getty

Recording artists Luke Hemmings, Ashton Irwin, Calum Hood and Michael Clifford of 5 Seconds of Summer attend the 2014 Billboard Music Awards Las Vegas, Nevada. Picture: Getty

Christine Teigen arrives at the 2014 Billboard Music Awards is Las Vegas. Pictures: Getty

John Legend and Christine Teigen arrive at the 2014 Billboard Music Awards is Las Vegas. Pictures: Getty

LAS VEGAS, NV - MAY 18: Host Chris 'Ludacris' Bridges attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. Frazer Harrison/Getty Images/AFP== FOR NEWSPAPERS, INTERNET, TELCOS & TELEVISION USE ONLY ==

Singer Billy Ray Cyrus attends the 2014 Billboard Music Awards. Picture: Getty

Jordan Sparks arrives at the 2014 Billboard Music Awards is Las Vegas. Pictures: Getty

Shania Twain arrives at the 2014 Billboard Music Awards. Pictures: Getty

Jack Antonoff arrives for the 2014 Billboard Music Awards. Pictures: Getty

Lucy Hale arrives at the 2014 Billboard Music Awards is Las Vegas. Pictures: Getty

Jennifer Lopez arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

Jennifer Lopez arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty

LAS VEGAS, NV - MAY 18: Choreographer Casper Smart and singer Jennifer Lopez attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. Frazer Harrison/Getty Images/AFP== FOR NEWSPAPERS, INTERNET, TELCOS & TELEVISION USE ONLY ==

Jennifer Lopez arrives at the 2014 Billboard Music Awards in Las Vegas. Pictures: Getty