By Jen Heger - Breaking Celebrity News Assistant Managing Editor

Adrienne Maloof's reality TV cast mates are coming down firmly on her side in her bitter divorce battle, especially after her estranged husband, Dr. Paul Nassif, had lunch at Lisa Vanderpump's restaurant Monday, and then Tweeted about it, Breaking Celebrity News is exclusively reporting.

"For Paul to go to Lisa's restaurant and then Tweet about it was just a huge publicity stunt and obviously meant to get under Adrienne's skin," a source close to the situation tells Breaking Celebrity News. "Kyle Richards, Taylor Armstrong and Kim Richards think that Paul is using his divorce drama to further drive a wedge between Lisa and Adrienne.

"Paul knows the hell that Adrienne went through during filming of the third season because of Lisa and Brandi Glanville's antics. Taylor, who went through hell with her own husband previously, has been especially supportive of Adrienne during this tough time and a majority of the cast stands by her and think Paul is just an opportunist who will stop at nothing to make Adrienne as miserable as possible.

“Adrienne wasn't surprised that he went to Lisa's restaurant. No, he didn't eat with Lisa and Ken, but there are hundreds of restaurants in Los Angeles, and he obviously had an ulterior motive in going to Villa Blanca."

“Paul has been trying to get Lisa to be on his side in the custody fight he’s in with Adrienne,” a source previously told Breaking Celebrity News. “He even wanted her