Credit: Michele K. Short/FX © 2013 Fox Broadcasting Company Photo: Lily Rabe and Stevie Nicks on the Set of American Horror Story: Coven

The White Witch cometh — again!

Three weeks ago, back when Misty Day (Lily Rabe) seemed like the heir apparent for the Supreme-ship on American Horror Story: Coven, Stevie Nicks dropped by Robichaux to help her embrace her powers — leaving Misty an ominous sentiment. "Good luck with the Seven Wonders."

Now, Coven is coming to a climax with Episode 13 ("The Seven Wonders") tomorrow, January 29, and — sure enough — Stevie is coming back to see how Misty and the rest of the Supreme hopefuls fare in the deadly test.

Even better, the Fleetwood Mac singer's storyline in her reprise appearance was her brainchild, as AHS co-creator Ryan Murphy tells Entertainment Weekly.

"[She's] doing an idea that she came up with that I thought was too perfect to say no to. Hilariously, Stevie read some of the scripts and called up and said, 'Are you aware that one of the things you're doing I actually wrote a song about?' I’m like, 'You've got to be kidding.' Then I remembered the song. We have something cool that was her idea."

Ryan declined to say which episode the 65-year-old would grace, but there's only one episode left — and Stevie is listed in the cast for the finale on IMDb.

Be sure to watch Stevie and the rest of the witches in the American Horror Story: Coven finale tomorrow night, Wednesday, January 29, at 10 p.m. ET on FX.

Source: Entertainment Weekly, IMDb

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!