British Indie singer FKA Twigs is reportedly fame-hungry and that, not Robert Pattinson's alleged cheating ways, is threatening their engagement.

According to Celebrity Dirty Laundry, FKA Twigs only tasted fame after it was reported that she was dating Robert Pattinson.

"Twigs' changing attitude has been a key part of why they initially delayed their wedding," it said. "Robert noticed that FKA Twigs, born Tahliah Debrett Barnett, went from wanting a small, pub-style wedding to a grand spectacle filled with her new celebrity pals."

Previously, Star magazine reported that Robert Pattinson is allegedly dating Sienna Miller which threatened the engagement with FKA Twigs.

"They're spending a lot of time hanging out in each other's trailers and often meet up for late-night pub runs," the source reportedly claimed. "The cast and crew are picking up on the mutual attraction."

"They fight," the source added of Robert Pattinson and FKA Twigs. "Rob threatens to break up with her and Twigs dares him to. With Sienna in the picture, no one would be surprised if he made good on his threat."

"Robert and Tahliah haven't broken up, but the strain of Twigs' hunger for fame is definitely causing problems for the couple behind the scenes," CDL added. "Where Pattinson tries to remain private and aloof, FKA Twigs is open to saying anything that will grab attention."

People magazine previously claimed that the "Twilight" actor and the English Indie singer "have drifted apart" and the wedding right now is "off the agenda."

However, Robert Pattinson and FKA Twigs have not called off the engagement yet, which means the wedding is still on the table.

"They've definitely drifted and have barely spoken while he's in Belfast and she's been in the States," the insider told People. "Rob has never been at ease with twigs' entourage."

Robert Pattinson and FKA Twigs were said to have been engaged during the Coachella Music Festival earlier this year.