There might be some friction between some of the actresses on American Horror Story according to a recent report.

Co-stars Emma Roberts and Gabourey Sidibe might be feuding on the set of American Horror Story: Coven according to a new report by Star magazine. The report claims that Roberts has been acting like a diva and Sidibe isn't having any of it.

"Emma complains about the tiniest things and won't speak to crew members," a witness told the magazine. "Gabby finally told Emma to cut her attitude and stop being rude."

The source said that the confrontation may have caused Roberts to be nicer on set but added that "she still acts like she's above everyone else."

Assuming the source is accurate, their behavior wouldn't be that much different from their onscreen personas on American Horror Story: Coven. Roberts plays Madison Montgomery, a diva-like witch who often feuds with fellow witch Queenie, played by Sidibe.

Regardless, Roberts herself denied the story on Twitter, directly replying to Star magazine:

Another report from GossipCop is denying the claim that Roberts and Sidibe are having any problems on the set.

According to a source close to Roberts, "Emma and the cast and full crew are like family." A production insider for American Horror Story is also quoted as saying that Roberts is "well-liked" on set and has "never been a problem" to anyone in production.

Will Dylan McDermott Return for American Horror Story: Coven? 

American Horror Story: Coven airs Wednesdays at 10 p.m. on FX.

Watch a trailer for the next episode here:

Tags: American Horror Story American Horror Story: Coven emma roberts Gabourey Sidibe