iHeartMedia announced today the star-studded line-up for the fifth annual iHeartRadio Music Festival, the highly anticipated mega-concert event that re-writes radio history every year, taking place on September 18 and 19 in Las Vegas. This year's lineup will feature Kanye West, Sam Smith, The Who, Coldplay, Demi Lovato, David Guetta, Kenny Chesney, The Weeknd, Tove Lo, Lil Wayne, Fall Out Boy, Disclosure, Hozier, Jason Derulo, Duran Duran, Prince Royce, Diplo, Trey Songz, The Killers, Blake Shelton, Nick Jonas, Janet Jackson and more. The IHEARTRADIO MUSIC FESTIVAL will also include performances from this year's Macy's iHeartRadio Rising Star winner, Christina Grimmie, as well as other surprise special guests and the kind of never-before-imagined collaborations that the IHEARTRADIO MUSIC FESTIVAL is known for.