According to TMZ, Porsha's good friend Jami Ziegler floated into the shindig on the arm of a man, and something about that man pushed Porsha over the edge.
Sources claim that Porsha first tried to get Jami kicked out from the party, but she left on her own. Then, Porsha followed Jami outside, shoved her to the ground - then started punching and pulling hair.
The fight was broken up quickly enough that cops weren't called, and there were no serious injuries. The site reports that the Bravo cameras missed the action and the fight was not filmed.
As for what set off Porsha? Apparently she's got bad blood with Jami's guy, though it's unclear why.
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Photo Credit: Bravo