The Real Housewives of Beverly Hills star has been forced to deny the cheating claims after they were blamed for Cibrian's new wife, LeAnn Rimes checking into a treatment facility.
"I'm NOT cheating with. Y ex husband I would never do that #EWWWWWW," Glanville wrote on her Twitter page Sunday.
Glanville has had a long time rivalry with who famously began her affair with Cibrian when he was still married to Glanville and she was still wed to Dean Sheremet.
Despite their bitter relationship - which often took place in the form of a slanging match on the social networking site - Glanvile and Rimes appeared to have most recently reached a truce.
In fact Glanville took the high road when she heard about Rimes' recent dramas and even offered her support.
"I totally support LeAnn's decision to enter rehab," Glanville said in a statement. "My top priority is my children and at the end of the day we are a family.
"LeAnn is their stepmom, and they love her. I am wishing her all the best and I hope she will find what she is looking for while in rehab."
However that hasn't stopped the rumors that Glanville is finally getting her revenge on Rimes for her role in ending her marriage.
Rimes checked into a facility for "stress and anxiety" at the end of last month after a string of Twitter messages from women criticizing how she hooked up with Cibrian during his marriage to his now ex-wife.
Rimes left her treatment Friday for left her treatment Friday for three days of concerts. She's announced she'll be returning to the facility Monday.