Antonio Brown ruthlessly went after his old buddy, Tom Brady, during the quarterback's reported rough patch with Gisele Bündchen ... trolling TB12 by posting an old pic of him hugging the supermodel after the Super Bowl.
AB -- who once lived with Brady and Gisele after joining the Patriots and Buccaneers -- has seemingly turned on the 7-time champ as his marriage appears to be on thin ice.
Brown didn't go into detail on the reason behind his post -- his caption only referenced his viral rap song, "Put That S*** On.