Porsha Williams Kicked In The Gut ... By 'RHOA' Co-Star

EXCLUSIVE

0831-porsha-williams-cyntha-bailey-TMZ-01'Real Housewives of Atlanta' has figured out a way to replace NeNe Leakes ... with a good old fashioned bitch fight. 

We're told Porsha Williams was on a boat in ATL with fellow castmate Cynthia Bailey when things got hot. The 2 women began arguing about nothing and Porsha started calling Cynthia a bitch. Cynthia tried to disengage, walking to the other side of the boat, but in true form Porsha followed.

Porsha got in Cynthia's face, and that's when Cynthia exercised self-defense, kicking Porsha in the stomach. Producers came in before Porsha could react and restrained her.

As for injuries ... Porsha went to the hospital, where she scored pain meds.

And big surprise ... the fight was captured on camera.