The producers of Glee said they wouldn't bring in high-profile guest stars this season, but apparently exceptions can be made for Mr. Ricky Martin.  Martin has been brought on to appear in one episode that's currently being filmed.  In November it was announced that Martin would be appearing as a sexy Spanish teacher and would headline at least two musical numbers in the episode.

Martin has tweeted a photo of himself with the cast of Glee, announcing that it was his first day of filming.  Cast member Lea Michele also tweeted a photo of herself with Martin and said that she's known him for years: "I've known Ricky since I'm 8 years old! He was in Les Mis on Broadway with me in 1996! Crazy huh?!"

You can view both photos below.  Glee is currently on hiatus, but will return with a new episode on Tuesday, January 17 at 8:00 p.m. ET on Fox.  Watch a trailer for the return and listen to the cast do a cover of Grease's "Summer Nights" here.