Mr. Schue (Matthew Morrison) had better watch his back because McKinley High's new Spanish teacher is about to steal his Gleeks.

In Tuesday's episode of Glee, aptly titled "The Spanish Teacher," Latin heartthrob Ricky Martin guest stars as the new foreign language teacher who becomes more popular than Mr. Schue.

"I go to night school now because I need to know how to speak Spanish so I can teach Spanish," Morrison told Access Hollywood. "He comes in and I bring him into the Glee Club and people like, really love him, he's a great teacher and stuff, so my job is kind of on the line now because the kids really love him."

Watch Martin and the Glee Club shake their bon bons to a bilingual cover of LMFAO's "I'm Sexy and I Know It." Does Mr. Schue have anything to worry about?

Tags: Ricky Martin