The legendary Stevie Nicks!— Ryan Murphy (@MrRPMurphy) November 12, 2013. Stevie Nicks is already a presence on American Horror Story: Coven, thanks to witch Misty Day's (Lily Rabe) idolization of the Fleetwood Mac singer. But now she'll be on the show in the flesh, too. Series creator Ryan Murphy tweeted Tuesday that Nicks will appear as a guest star later this season.