The holiday season may have turned into a disaster for Robert Pattinson and FKA Twigs.

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On Friday, OK! Magazine reported that the singer flipped out when she apparently discovered that her fiance had been calling his ex-girlfriend Kristen Stewart. If he really did do this, then he may have had an excuse that Twigs can't believe.

"She confronted him about it straight away and he insisted it was just a good will congratulations about Kristen being in the Oscar race this year," a source told the publication. "She's not happy at all about this and isn't really satisfied with his explanation."

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Stewart is getting some Oscar buzz for her role in the film Clouds of Sils Maria. And even though Twigs is "not the jealous type at all," she might have discomfort over Pattinson's relationship with his "first big love."

"She knows how hung up Rob was on Kristen and how hard it's been for him to move on," the source said. "So the fact he's gone and done this has totally unsettled her."

Meanwhile, Stewart previously spoke with Los Angeles Times about her Clouds role, explaining what persuaded her to take it on.

"Initially, I looked at it as something that moved me," the actress said. "It was very emotional, but it was kind of interesting banter between two women. It was an interesting role for me to play considering my position in the business and my awareness of how potentially superficial and strange it can be and how funny it would be to hear certain words come out of my mouth."

Tags: Robert Pattinson FKA Twigs Kristen Stewart