'RHOBH' Feud Explodes! Kyle Richards & Yolanda Foster Trap Lisa Rinna In The Middle Of Their Showdown

Kyle Richards and Yolanda Foster began fighting over lunch after a SoulCycle class for charity. Kyle instigated the feud by whispering to Lisa Vanderpump, asking if Lisa knew about the alleged "threat" Yolanda made against her.

Yolanda, 55, previously said that Lisa, 52, was spreading rumors about Munchausen's disease — and she could easily retaliate by claiming the Days of Our Lives actress was bipolar.

Erika Girardi called out the Lyme disease plagued star first, saying, “Lisa Rinna says you said she was bipolar.”

The former model immediately became defensive and denied it. “I could potentially call her bipolar but I would never do that because it’s not my place to do so," she claimed.

Kyle came to the Depends commercial actress' defense, as she alleged that even saying "bipolar" puts negative vibes out there since Lisa never said that Yolanda had Munchausen's. The child star also claimed that Yolanda was actually the one starting gossip that could hurt someone's "reputation" and "integrity."

Yolanda fired back at Kyle, telling her that she's "making it her business" and to "just relax and have a glass of wine." Kyle told Yolanda to give her "a f*king break," and Gigi Hadid's mom dismissed her, saying: “I’m telling you not to talk about me or Lisa Rinna when Rinna is not here to defend herself." She also claimed she had dirt on Mauricio Umansky's wife, adding: "I hold a lot in the vault honey.”

Lisa then came to Kyle's defense saying, "A good friend doesn’t store secrets to use them at a later date.”