Play video content EXCLUSIVE TMZ.com

Porsha Williams is out one gun, and a few expensive handbags, after someone broke into her SUV and jacked her stuff ... TMZ has learned.

Sources close to the 'Real Housewives of Atlanta' star tell us Porsha left her Range Rover in a garage at her assistant's home last week in the Buckhead section of ATL. An eyewitness says a man wearing a mask smashed a back window to get into the vehicle.

We've confirmed police took a report and are investigating.