Guest Stars Ryan Seacrest as Himself Ed Sheeran as Himself Pitbull as Himself Selena Gomez as Herself Joe Manganiello as Himself Jennifer Lopez as Herself Ashley Greene as Herself Adam Lambert as Himself Ariana Grande as Herself Hilary Duff as Herself Gwen Stefani as Herself Jared Leto as Himself Shakira as Herself Blake Shelton as Himself Lionel Richie as Himself Usher as Himself Pharrell Williams as Himself Kesha as Herself 30 Seconds to Mars as Themselves Mel B as Herself Arcade Fire as Themselves Luke Bryan as Himself Sean Combs as Himself (Sean "Diddy" Combs) 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 Bobby Bones as Himself