Jeana Keough and Tamra Barney apparently won't be exchanging holiday cards this year.

Keough and Barney got physical and threw wine at each other while Bravo's cameras were rolling at The Real Housewives of Orange County's sixth-season wrap party at Vicki Gunvalson's house on Saturday night, RadarOnline reported Monday.

According to RadarOnline eyewitnesses, the "wild brawl" began after Barney confronted Keough -- who has remained friends with Barney's estranged husband Simon Barney, who filed for divorce earlier this year -- about allegedly "wildly inaccurate" "lies" she has said about Barney in recent interviews.

However Keough reportedly refused to agree to back off, resulting in Barney attempting to present Keough a cease and desist letter from her attorney.

"Jeana wasn't budging and finally Tamra said, 'Here's a cease and desist letter from my attorney,'" the eyewitness told RadarOnline.

But Keough allegedly refused to accept the letter and began swearing.

"Jeana said to Tamra, 'You're a b-tch and I'm gonna throw your a-- in the pool," the eyewitness said. "It was crazy -- It looked more like an out-of-control bar scene than a party!" 

Keough then allegedly pushed Barney onto someone behind her, causing Barney to fire back by throwing a glass of wine in Keough's face.

Keough attempted to retaliate by tossing her own glass of wine at Barney as she walked off, however she missed and hit another woman instead -- resulting in the wine-soaked woman lunging at Keough and pushing her up against a wall, according to the eyewitness.

Barney reportedly left the party shortly thereafter but encountered Keough and a male friend in the driveway, leading to another brief incident in which the friend threw a wine glass at Barney's feet, sending shattered glass everywhere.

"If the cameras caught half of what happened Saturday night, it's going to be the craziest episode of [The] Real Housewives of Orange County anyone has ever seen," the eyewitness said.