Guest Stars John Legend as Himself Lady Gaga as Herself Chris Stapleton as Himself Sam Smith as Themselves Ariana Grande as Herself Lionel Richie as Himself Demi Lovato as Themselves Anna Kendrick as Herself James Corden as Himself Carrie Underwood as Herself Gwen Stefani as Herself Bruno Mars as Himself Stevie Wonder as Himself Diplo as Himself Kendrick Lamar as Himself Little Big Town as Themselves Selena Gomez as Herself Kaley Cuoco as Herself Seth MacFarlane as Himself Taylor Swift as Herself The Weeknd as Himself Adele as Herself Luke Bryan as Himself Don Cheadle as Himself O'Shea Jackson, Jr. as Himself Stephen Colbert as Himself Gary Sinise as Himself Tyrese Gibson as Himself Ice Cube as Himself Ellie Goulding as Herself Justin Bieber as Himself Ryan Seacrest as Himself Ed Sheeran as Himself Pentatonix as Themselves Nile Rodgers as Himself Andra Day as Herself Meghan Trainor as Herself Joseph Simmons as Himself (Rev Run) Cam as Herself Tori Kelly as Herself Skrillex as Himself Sam Hunt as Himself Anquan Boldin as Himself Von Miller as Himself James Bay as Himself Phillip Riggs as Himself Irving Azoff as Himself Miguel as Himself Alabama Shakes as Themselves