Credit: Adam Rose/FOX © 2011 Fox Broadcasting Co.; YOOX.com

The familiar faces keep lining up for what is turning out to be a star-studded celebration for Glee's 100th episode. Newly confirmed to be appearing in the show's milestone episode: Gwyneth Paltrow (Holly Holliday)! Get excited!

Gwynie has played sexy substitute teacher Holly in three previous episodes, with the last one being Season 2's "A Night of Neglect." So we wonder what Holly is up to now. Perhaps she's still teaching French in Cleveland? We can't wait to find out!

And the even-better news is that Holly will indeed be singing during the episode. As you know, the selection of songs in the episode was voted on by Glee's fans, who voted for their ten favorite previous Glee tunes, which will then be redone in the two-part episode special. 

Unfortunately, there's been no official word as to which song Holly will sing. However, there's a rumor going around that she'll perform "Dog Days Are Over" with New Directions. We hope all you fans of Holly's rendition of "Forget You" aren't too disappointed that she's not doing that one.

As far as what will happen in the episode, we're still trying to wrap our heads around a report that everyone is coming back to McKinley to say goodbye to Will Schuester (Matthew Morrison) in the episode, as Sue Sylvester is finally going to succeed in shutting down the glee club. Say it ain't so!

Are you happy that Holly is returning? And which song do you want to hear her sing?

Source: The Hollywood Reporter, E! News