Richards, who has been part of the Bravo franchise since its 2010 debut, accused newbie Beauvais of not forking over a promised $5,000 at her charity event.

“You came to my charity event, raised your paddle to donate $5,000 to Children’s Hospital Los Angeles and never paid,” Richards claimed, leading Beauvais to respond, “What?!”

Richards, 51, continued, “You were not being genuine.”

Beauvais, 53, said Richards’ accusations were “not true,” and that Richards “better watch what you’re saying, that is not true.”

Richards didn’t back down, claiming “no payment has been made,” as her fellow “Housewives” watched the intense back-and-forth from their own homes.

“Well, then something went on. You think I would say I’m going to pay for it…,” Beauvais said as Richards lobbed, “We have to be honest on camera. How you feel about me, if you’re upset about something, it has to be genuine.”

“I just said what I said how I felt about you, but then you went on Twitter, and I was warned by somebody here that that’s what you do,” Beauvais said, claiming of Richards, “You wait until the show comes out and then you tweet and you get all your fans behind you and I never tweeted anything negative at you.”

When host Andy Cohen asked Beauvais which cast member had warned her about Richards, she responded, “I’m not doing that.”

He then asked the other ladies if anyone would own up, but they all stayed silent.

Richards said she “only said nice things” about Beauvais in her interviews, noting the only issue with her co-star is that, “I don’t think you were nice to me.”

Beauvais fired back at Richards and again called out the tweets.

According to a screenshot Bravo shared during the reunion, Richards had tweeted, “Garcelle snickering that my outfit is hideous while wearing stretchy purple knee high boots with a pink suit dres… that her stylist picked for her.” The tweet appears to have since been deleted. 

Richards maintained, “My tweets were I’ve been nothing but kind to this woman, that’s one of the things I tweeted and that’s the truth.”

A rep for Beauvais did not immediately respond to our request for comment.

The second part of the reunion airs next Wednesday at 9 p.m. EST on Bravo.