He explains, "She's coming back specifically to date Will. Those two have become really good friends in real life and had really good chemistry. She's coming back as a sex education teacher.
"Gwyneth and I are emailing, talking every week: What are we gonna sing? We're trying to do something fantastic. She comes back in January and she's with us for three and a half weeks, I think."
And Ryan Murphy has revealed he's also using Lady Gaga's new song Born This Way as a major theme for an upcoming episode.
He tells EW.com, "We're going to do a whole episode that's about that song."