The two met up to chat, and Denise, 49, admitted she lied to get out of going to Dorit Kemsley's housewarming party. "I did not want to go and have her create some f--king Jerry Springer moment," Denise explained about Brandi Glanville, who alleged earlier this season that she had an affair with the actress.
"We were worried about you. ... You said, 'Family emergency.' You lied! That's a lie!" Lisa said.
Rinna asked Denise why she never spoke with Glanville, 47, over the affair accusations. "I don't even want to say how it was dealt with, but it's being dealt with," the blonde beauty said.
"I witnessed something that really confused me," Rinna said. "You have had a long relationship with Brandi Glanville. Platonically or whatever, because you have a very long text message chain with her, Denise."
"I don't care what texts she has," Denise said. "My interaction with her was very limited ... I've seen her four times in my life. She was an acquaintance! That was it!"
Denise — who accused Rinna of playing "dirty" — claimed to Rinna that Glanville had the so-called text messages altered to make it look like they had hooked up, but Richards insisted it's not true. "There is an app that can revise text messages, so whatever Brandi has, I don't even care," Richards told the camera.
"If I'm going to be put in a corner where I have to present text messages, not only will I present Brandi's, I will also present Lisa Rinna's, and I don't think either one of them want me to do that," Richards told the cameras. "But I will."
Rinna then talked about how Richards had cease and desist papers delivered to the cast and producers, allegedly getting them to pull unfavorable footages from the show. "You wanted the footage taken out," she said, which upset Richards. "Who told you that?" Richards fired back.
Earlier in the episode, Richards bailed on Kemsley's party and got her husband, Aaron Phyphers, to lie for her and make up a story that there was a "family emergency." Rinna seemingly decided that Richards has lied too many times.
“Listen," she told castmates. "She was married to Charlie Sheen and she fought him in the press for 14 years with 14 different lawyers. She learned how to protect herself. She's gonna make all of us bad guys, just so you know. We will all be the mean girls. We will all be horrible."
“I know how this game works," she said. "If you don't think she's capable of this, you're f--ing crazy.”
Kemsley, 44, thought that a housewarming event would see her friends spend some time together and would help heal the strained relationship between Richards and Rinna. Ultimately, Rinna started telling Teddi Mellencamp Arroyave that Richards hadn't been honest about her relationship with Glanville.
“'I'm torn, 'cause I would like to be a good friend for her, and I don't feel like I've been a great friend," Rinna said. “But now I go, 'You know what? Maybe I have been a great friend, and you're being a s--ty friend.' And she's gonna have to take responsibility for it."
“You make your bed, you have to sleep in it," Rina added. "And sometimes that bed is f--ing filled with nails and snakes.”
The show ended with Rinna, Kyle Richards, Mellencamp Arroyave, Sutton Stracke, and Kemsley traveling to New York to see the Broadway debut for their pal Erika Jayne. Denise and Garcelle Beauvais didn’t make it to the trip.
The season 10 reunion of RHOBH airs on Bravo Wednesday, September 2, at 9 p.m. ET.