There might be some trouble in paradise happening with Robert Pattinson and his fiancee, FKA Twigs- and it could have to do with the actor's ex.

Robert Pattinson & FKA Twigs Show Naughty PDA Together

On Monday, OK! Magazine reported that Pattinson and Twigs had their first big fight since their engagement. According to an insider, the Twilight star's former girlfriend Kristen Stewart has been "spreading poisonous rumors" about Twigs and that's apparently not the only thing that caused the fight. It appears that Twigs is not a fan of living in the spotlight that involves the media constantly surrounding her relationship.

"She's been ripping into Rob, telling him she didn't sign up for this media circus and saying she had no idea it was going to be this bad," the source said.

Did FKA Twigs Send Kristen Stewart A 'Brutal' Message?

While Twigs reportedly has to deal with the tabloids and her fiance's ex-girlfriend, it also appears that Pattinson's family "never really approved of their engagement."

"It's all gotten too much for Twigs," the insider added.

It was also reported from OK! Magazine last week that Twigs was not happy when she found out that Stewart opened up to Harper's Bazaar about her love scenes with Pattinson on set of the Twilight series.

"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 moment she got in the car with [Snow White and the Huntsman director] Rupert Sanders," a source said. "It was pretty brutal."

Stewart and Sanders were part of a scandal a few years back when it was alleged that the two were having an affair.