Dianna Agron confirmed for 'Glee' 100th Episode

Dianna Agron is coming back to Glee for the 100th episode.

Ryan Murphy confirmed the news earlier today.

http://twitter.com/MrRPMurphy/status/408688393246081024

Dianna joins original cast members Heather Morris, Amber Riley, Harry Shum Jr. and Mark Salling, who were all extended invitations to be on the 100th show.

Kristin Chenoweth is also appearing.

The episode will air on March 18, 2014 on FOX.

So it really looks like Dianna was overlooked for the Cory Montieth episode. She said that she had waited for an invitation to be on that special, while Ryan Murphy noted that he just accepted offers from cast members who wanted to be on the show (as opposed to reaching out).