Bethenny Frankel is furious with LuAnn de Lesseps.

After feuding throughout the eighth season of The Real Housewives of New York City, Frankel spoke out against her co-star, claiming that she's like a "cockroach" who just won't go away.

“She is like a cockroach. She is going to do anything to survive. And you can’t blame a cockroach for what it does. It’s part of life. You’re not gonna live in New York and not see them. They’re here to survive, and it could be a nuclear bomb, and they will crawl right out,” Frankel explained to Us Weekly magazine on Friday.

During the season, Frankel and de Lesseps feud kicked off during a group vacation where Frankel called de Lesseps a “sl*t, and liar and a hypocrite.” She then revealed to de Lesseps that her fiance, Tom, had cheated on her with another woman at a bar. However, rather than thank Frankel for the damning information about her soon-to-be husband, de Lesseps stuck by the alleged cheater and proceeded to suggest that Frankel was a mistress and had begun dating her current boyfriend, Dennis Shields, prior to Shields' separation from his wife.

“I can’t believe that someone would absolutely just blindly make up a lie just to get the stench off of them. I couldn’t believe it,” Frankel said of the allegation.

In response to de Lesseps' claim, Frankel called her boyfriend's daughter to set the record straight.

“I [told host] Andy [Cohen], ‘When someone accuses me of being with someone who’s cheating while he’s living in his house, yeah, I’m not very light and bright. And I wasn’t leaving there until there was a blood sample, there was a lie detector test, a full trial,” she revealed.