Real Housewives of Beverly Hills: Adrienne Maloof and Dr. Paul Nassif in the Midst of " Very, Very Nasty Divorce Proceedings"

The separated "Real Housewives of Beverly Hills" couple, Adrienne Maloof and Dr. Paul Nassif, are in the middle of a divorce debate and discussions are getting heated.

On Aug. 31, the reality stars were seen with their respective attorneys huddled in a courthouse cafeteria together while discussing custody matters.

Maloof and Nassif's attorneys were planning to file an emergency motion, but at the last minute decided not to because the judge's full schedule. However, RadarOnline.com's reported Maloof was looking serious in black pants and a black top while talking to her estranged husband and his lawyer, Lisa Helfend Meyers, in the cafeteria, sources said.

"The matter they are attempting to mediate and deal with involves their children," a source told RadarOnline.

Both parties cited "irreconcilable differences" as the cause of divorce.

In Nassif's divorce documents, he acknowledged signing an iron-clad prenup (which protects the Maloof family fortune) and stated that he wants joint legal and physical custody of the couple's three sons, according to TMZ.

"This is turning out to be a very, very nasty divorce proceedings so far and the fact that Paul and Adrienne had to go to court on an emergency basis this early in the proceedings isn't a good sign," the RadarOnline insider said.

According to a previous RadarOnline article, a source close to Maloof said, "Adrienne is going to fight Paul for full legally custody of the kids. She wants primary physical custody."

The source went on to explain, "She says she is the parent who is with the kids the most, and she will do everything she can to keep them. She believes this is what is best for them."