FKA twigs is supposedly furious at Kristen Stewart for talking about her fiancé, Robert Pattinson.

According to OK! Magazine, FKA is angry at Stewart, who described her "Twilight" sex scenes with co-star and ex-boyfriend Pattinson as agonizing and "grotesquely uncomfortable" in an interview with Harper's Bazaar UK, via People. 

A source claimed the "Pendulum" singer believes the "Still Alice" actress has no right to say anything about "The Rover" actor since she cheated on him with her "Snow White and the Huntsman" director, Rupert Sanders. 

"She sent a message to Kristen to 'shut the f**k up' about Robert because she lost the right to speak about him in public," the source revealed. "It was pretty brutal."

After Stewart cheated on him, Pattison supposedly opened up to twigs about "the whole nightmare," which made him want "to quit acting forever" at one point.

The insider added that the "Video Girl" hitmaker is "Rob's fiercest defender," especially since the two are set to walk down the aisle soon. The source believes that Stewart won't be talking to Pattinson anytime soon. 

In addition, HollywoodLife previously reported that since Stewart's infidelity, Pattinson has been struggling with trust issues.

"Robert has had his struggles trusting anyone," a source said. "It really knocked his confidence."

As a result, the actor was "putting serious consideration" into a prenuptial agreement with his lover before wedding.

"There's obviously a big difference in the wealth both Robert and FKA twigs have attained in their careers," the source continued. "Robert wants to be careful, just in case it doesn't work out."

The source added that Pattinson ultimately wants to protect himself from losing his estimated $100 million fortune in case of a possible divorce.