Twilight stars Kristen Stewart and Robert Pattinson are reportedly having more trouble with each other ever since the actor allegedly started dating his ex-girlfriend's pals.

Robert Pattinson Is Keeping It 'Low-Key?'

On Thursday, Celebrity Dirty Laundry posted a story that came from OK! Magazine that involved how Stewart's reacted to Pattinson's alleged hookups with other women. According to the magazine, "Dakota Fanning, Katy Perry, Riley Keough, Imogen Kerr. What do they all have in common? They're Kristen Stewart's BFF's- and Robert Pattinson's latest gal pals!"

Apparently, Stewart is angry about this and even left her ex a nasty voicemail on how she feels about this.

Kristen Stewart Went To Paris Without Her Ex?

"Kristen thinks Rob is hooking up with them purposely to punish her for the way their relationship ended- and she's ticked. She flipped out on his voicemail," a source allegedly said. "There are thousands of girls in L.A. Why does Rob need to hook up with her friends? He's got to stop using her circle as a dating pool."

The former couple were set to make an appearance at Cannes Film Festival this year, which led to rumors of them running into each other. It turned out that they wouldn't appear on the same day, and rumor has it that Stewart is the one who caused that.

"Kristen avoided coming to Cannes until Rob had left," a source told Hollywood Life. "She does not want to party with Rob right now, he's really hurt her. She can't stand seeing him dating all these other girls, it's too much to take, she loves him and unless he tells her that he wants to get back together she doesn't want to see him, it's too painful right now."

Tags: Kristen Stewart Robert Pattinson