Brandi Glanville called her ex-husband's wife LeAnn Rimes "insane," among other things, on Monday and the country singer has since fired back on Twitter to defend herself.

During her appearance on Bravo's "Watch What Happens Live" with host Andy Cohen, the topic of Rimes came up after which Glanville called her "insane" and accused her of being Eddie Cibrian's "sugar mama."

Her comments followed an interview Rimes had with "Entertainment Tongiht" that aired Jan. 16 in which she discussed her extramarital affair with Cibrian and admitted that she worries "at times" that her husband of two years will cheat on her.

Rimes and Cibrian began dating in 2009 after meeting on the set of their Lifetime television movie "Northern Light." Both were married to other people at the time: Cibrian and Glanville already had two children together and Rimes was married to Dean Sheremet.

"Every day there's a tell-all," Glanville said of Rimes' interview. "It's kind of cray-cray!"

Cohen then referenced Glanville's tell-all book, titled "Drinking and Tweeting," and asked the reality star whether she was implying that Rimes is Cibrian's "sugar mama."

"It's kinda true," Glanville said, adding that Cibrian always wanted to live in a big house with a gated community and Rimes helped him fulfill those dreams.

"Do you think that now she is..." Cohen asked before Glanville interjected with "Insane?"

"Do you think that?" the Bravo hosts asked, and Glanville replied, "Yes, I do." Glanville added that she "knows" Rimes watches "RHOBH" because her son saw a picture of Cohen and said, "Oh, that's Le-Le's favorite show."

"She's watching now," the model said, sarcastically adding. "Hi, LeAnn! Hi, Le-Le! Call me!" while blowing kisses to the camera.

Rimes shared her thoughts on Glanville's comments via Twitter, posting, "Wow the texts from my friend. Kisses and KMA [kiss my ass]."

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Brandi Glanville, LeAnn Rimes