Gabourey Sidibe has joined the cast of 'American Horror Story: Coven'.

The 'Precious' actress will star on the third season of Ryan Murphy's thriller, joining fellow newcomer Kathy Bates and returning castmembers Jessica Lange, Evan Peters, Sarah Paulson, Taissa Farmiga, Frances Conroy and Lily Rabe.

Ryan tweeted: ''Thrilled to announce Oscar nominee Gabourey Sidibe is joining the cast of 'American Horror Story: Coven.'''

Although it will focus on witches, Ryan recently promised the third season of the show will be more upbeat than before.

He said: ''It's a really cool story that we've been talking for a couple years, and this seemed to be the year to do it.

''What season three is about is more historical in nature,. I'm also interested in getting into a horror romance. That's certainly something that's going to be in the water for season three. You're going to see a very different tone in season three, but that's the joy of the show. I think as a person right now I do feel lighter and wanting to embrace something a little bit more fun.''