Guest Stars Ryan Seacrest as Himself Ed Sheeran as Himself Pitbull as Himself Selena Gomez as Herself Hilary Duff as Herself Jennifer Lopez as Herself Ariana Grande as Herself Blake Shelton as Himself Jared Leto as Himself Lionel Richie as Himself Luke Bryan as Himself Joe Manganiello as Himself Ashley Greene as Herself Gwen Stefani as Herself Shakira as Herself Mel B as Herself Usher as Himself Pharrell Williams as Himself Adam Lambert as Himself Kesha as Herself 30 Seconds to Mars as Themselves Arcade Fire as Themselves Sean Combs as Himself (Sean "Diddy" Combs) Bobby Bones as Himself Kendrick Lamar as Himself Lil' Jon as Himself Chester Bennington as Himself Bastille as Themselves Juanes as Himself G.R.L. as Themselves Juicy J as Himself L.A. Reid as Himself Dan Reynolds as Himself Jason Reader as Himself