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The "Real Housewives" are dealing with some real legal drama!

According to a letter obtained by Life & Style Magazine, "Real Housewives of Miami" star Joanna Krupa is suing "Real Housewives of Beverly Hills" star Brandi Glanville for slander, libel and defamation of character, following a TV appearance wherein Brandi alleged that Joanna slept with a married man.

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The incident in question occurred on 2013 episode of Bravo's "Watch What Happens Live." There, Brandi made her allegation and made another unsavory allegation about Joanna that isn't exactly fit for print.

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Joanna, for the record, has denied all the claims, telling Life & Style, that Brandi "doesn't even know me." Joanna's husband, Romain Zago, will also join the lawsuit against Brandi.

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The two "Housewives" stars have been at odds since that infamous TV episode, with Joanna even wearing a "Team Rimes" shirt, making reference to LeAnn Rimes, who Brandi's ex, Eddie Cibrian, left her for.