Season 4 of The Real Housewives of Beverly Hills hasn’t even completed filming yet and already Kyle Richards is threatening to quit after allegedly being bullied by her co-stars Brandi Glanville and Lisa Vanderpump.

Real Housewives Roundup: Wedding Bells, Lockouts and Another Tell-All >>>

According to RadarOnline, during filming last week, Brandi and Lisa approached Kyle with evidence that her husband, Mauricio Umansky, had been cheating on Kyle.

“Brandi maintained she had solid information to prove that Mauricio has been cheating on Kyle,” an inside source said. “Kyle became extremely upset, and refused to listen to the girls. She felt especially betrayed by Lisa because they had once been so close.”

The insider also indicated that Kyle was so upset after the blindside that she called the producer and told them that she no longer wanted to film for the show. The producers did talk her into sticking around for the rest of the season, but she is extremely unhappy with the way things are going.

“Kyle is just at a loss for words as to why she is being picked on by Brandi, Lisa and Yolanda [Foster],” the source said. “She feels that she is being targeted in the same way that Adrienne Maloof was last season.”

But unlike seasons past, Kyle has found an ally in her sister, Kim Richards, who previously took a back seat when it came to defending Kyle so to avoid confrontation.

“Kim has absolutely stood up for her sister, big time,” the insider said. “She got into a heated altercation with Brandi and Lisa telling them to butt out of Kyle’s marriage.”

According to Radar, Kyle is contractually obligated to finish season 4. But the source suggested that it would definitely be her last if her castmates continue to make her life so difficult.

Add The Real Housewives of Beverly Hills to your watch-list when you download our free BuddyTV Guide app for your phone.

(Image and video courtesy of Bravo)

Gina Pusateri

Contributing Writer, BuddyTV