So nasty and so rude! The drama between NeNe Leakes and Kenya Moore is just heating up.

The two Real Housewives of Atlanta stars, who have been feuding on and off for years, took their ongoing issues a step further this week. Model and actress Moore, 44, took to Instagram on Tuesday, Jan. 27, to share a legal document that takes the fight to the next level.

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The Instagram photo shows a typed document with a header reading, "RE: DEMAND TO CEASE AND DESIST DEFAMATORY STATEMENTS."

"Mrs. Leakes has learned that you have engaged in making false, destructive, and defamatory statements," the letter to Moore reads. "These statements have been made directly, by implication and innuendo during television broadcasts and through social media and the BravoTV blog. You are hereby directed to cease and desist making any and all false and defamatory statements, which are injurious to her character and reputation."

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"Your postings on BravoTV have been false, malicious and ostensibly made with the intent to cause damage to her reputation by exposing her to public hatred, contempt and ridicule, and injuring her in her trade and/or profession," the letter continued. "Particularly, your statement was made with the intent to directly injure and defame Mrs. Leakes and the perception of her in the broadcast of The Real Housewives of Atlanta (RHOA), her brand as a member of the cast, and her brand in the entertainment and celebrity industry in general."

Despite the serious tone of the letter, which Moore maintains was sent by legal representation for Leakes, the controversial RHOA star did not seem phased by the document.

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"I guess this is @neneleakes way of saying happy birthday!" she captioned the Instagram, referencing her recent 44th birthday on Jan. 24. "#RHOA #HypocrisyAtItsBest #byegirl #SheTriedIt #SoNastySoRude."

While Leakes, 47, did not respond directly to the Moore's post, she tweeted soon after the photo of the cease and desist letter was shared.

"The Thirst Is Real!" Leakes wrote. "They need me for press because they can't get none."