GLEE: L-R: Dani (guest star Demi Lovato), Elliot "Starchild" (guest star Adam Lambert), Santana (Naya Rivera), Kurt (Chris Colfer) and Rachel (Lea Michele) perform in the "A Katy or a Gaga" episode of GLEE airing Thursday, Nov. 7 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. CR: Adam Rose/FOX