'RHOBH' Lisa Rinna, Kim Richards Fight: Did 'Mad Men' Star Harry Hamlin Cheat On His 'Days Of Our Lives' Actress Wife?

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The Real Housewives of Beverly Hills released the season five trailer this week, but it's the fight between new castmember Lisa Rinna and veteran Kim Richards that has everyone talking.

In the sneak peek, Lisa and Kim are at a restaurant when Lisa breaks a glass and yells, "Don't you ever go after my f--king husband." The two had to be separated so the argument wouldn't escalate any further.

According to Radar Online, the incident happened at former housewife Adrienne Maloof's party in Hollywood. Kim accused the former Days of our Lives star's husband, Harry Hamlin, of cheating.

"Kim had heard rumors for awhile that Lisa Rinna's husband, Harry had been unfaithful," a source told the site. "Upon hearing the claim, Lisa went nuts, and immediately lunged at Kim. There are certain things that are just off limits as far as Lisa is concerned, and Harry is on that list."

Apparently, Kim was on the defensive because Lisa was one of her co-stars that accused her of not being sober anymore.

"The accusation was made after Lisa became very suspicious that Kim had fallen off the wagon during the cast trip to Amsterdam," according to Radar. "Kim didn't think Lisa would have such a violent reaction, and it really shook her up."

The fight caused a melee befitting a scene from the Bravo staple franchise.

"Lisa attempted to push Kim, and the women had to be physically separated!" the source continued. "Lisa even made threats against Kim. It was totally crazy."

"[Lisa wants] to get revenge on Kim and expose even more lies when the cast reassembles to tape the reunion of the show in the next few months," the source warned. "Lisa is a real firecracker and Kim opened a can of worms she will regret opening!"

As MStars News reported, the fight could be a way for the former Melrose Place star to ink a deal to come back next season.

Whose side are you on in the fight: Lisa or Kim?