You do not want to get on Heather Thomson's bad side!
The "Real Housewives of New York City" star showed off her inner gangster while confronting Aviva Drescher over the "slanderous" comments she's made this season about costar Carole Radziwill.
Check out the video above to see what Heather said to Aviva, which startled all of the other women at LuAnn de Lesseps' BBQ!
"Don't tell me motha f--king nothing," Heather screamed to Drescher. To which Aviva replied, "Did you learn that in prison?"
The ladies have been fighting for the last few episodes over comments Aviva made about Carole's book and career -- alleging that she had a ghost writer pen her New York Times Best Seller.
Now that Aviva's decided to write her own life story, the reality star seems to think that she knows more about the publishing industry than Carole, who's made a career out of it.
Heather has stood by Carole through the entire "Book Gate" drama, but should she back off a little?
What do you think of Heather's behavior on last night's "Real Housewives of New York City" episode? Sound off below!