Kristen Stewart vs. Robert Pattinson, 'Clouds of Sils Maria' Beauty Angry & Jealous of BFF Hook-Ups? Avoids 'Awkward' Cannes Film Festival Reunion

The drama surrounding Kristen Stewart's on-and-off again relationship with Robert Pattinson never seems to end. Now, rumors suggest that K-Stew's ticked-off at her "Twilight" ex - because he keeps hooking-up with all of her close friends! Is R-Patz trying to make the "Clouds of Sils Maria" actress jealous?

According to OK! magazine, 24-year-old Stewart recently left Pattinson a "nasty" voice-mail in regards to him "romancing" so many of her BFFs.

As the infamous tabloid points-out:

"Dakota Fanning, Katy Perry, Riley Keough, Imogen Kerr - What do they all have in common? They're Kristen Stewart's BFFs and Robert Pattinson's latest gal pals!"

K-Stew cheated on the British heartthrob with "SWATH" movie director Rupert Sanders a few years ago - now, Pattinson's allegedly looking for the ultimate payback.

"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," an alleged source explains. "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." 

Will tensions ever get resolved between Robsten?

Both stars attended the Cannes Film Festival this month, but went to extreme lengths to avoid any awkward confrontations. An insider tells HollywoodLife.com:

"Kristen avoided coming to Cannes until Rob had left. 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." 

Stay tuned for further updates!