Adam Lambert, Chris Colfer Face Off Over Gaga In ‘Glee’ Teaser: Watch

The 'Glee' guest star will make his debut on the November 7 episode of the Fox show.

Are you a Katy or a Gaga? Well, that’s what the Gleeks will be trying to figure out on this week’s episode of “Glee,” airing Thursday on Fox.

The episode, titled “A Katy or a Gaga?” will feature four tracks from the respective princesses of pop.

There will be two Lady Gaga tracks, “Marry the Night” (performed by guest star Adam Lambert’s Elliot Starchild) and “Applause” (performed by Sam, Blaine, Artie, Ryder and Marley). And there will also be two Katy Perry tracks, “Wide Awake” (Jake, Kitty, Unique, Tina) and “Roar.”

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