The Mean Girls musical really is happening—producers Lorne Michaels and Stuart Thompson just announced the cast. "The cast of Mean Girls will be led by Erika Henningsen as Cady Heron, Taylor Louderman as Regina George, Ashley Park as Gretchen Wieners, Kate Rockwell as Karen Smith, Barrett Wilbert Weed as Janis Sarkisian, Grey Henson as Damian Hubbard, Kerry Butler as Ms. Norbury, Kyle Selig as Aaron Samuels, Cheech Manohar as Kevin Gnapoor, Rick Younger as Mr. Duvall," the press release said.

But who is playing Mrs. George?!?

Tina Fey, who loosely based the 2004 film's screenplay on Rosalind Wiseman's non-fiction look at the horrible world of teen girls, Queen Bees and Wannabes, wrote the musical's book. The show features music from Emmy-winning composer Jeff Richmond (who is also Fey's husband) and lyrics from Tony-nominated Nell Benjamin. The show's description: "After years of living with her zoologist parents in Africa, Cady Heron moves to Illinois and must find where she fits in the social hierarchy. A sweet, naive newbie, Cady quickly attracts the attention of The Plastics, a trio of popular frenemies led by the vicious and calculating Regina George. When Cady devises a plan to end Regina’s reign, she learns that you can’t cross a Queen Bee without getting stung."

In May, Fey talked about the casting process, noting that the auditions are pretty similar to what Elijah on Girls went through:

There's no Broadway date for Mean Girls yet, but if you're dying to see it, plan on heading to D.C., where it'll be at the National Theatre, October 31 - December 3, 2017.