Oakland Raiders star lineman Donald Penn is in a BAD situation -- his wife says he knocked up a reality TV star ... and she's PISSED.
Dominique Penn laid it all out on her Instagram -- saying Donald (who's reportedly made $47 million during his NFL career) secretly hooked up with and impregnated Camilla Poindexter ... who appeared on multiple seasons of "Bad Girls Club."
"My husband cheated on me with this hood rat," Dominique posted.
"She knew he was married from jump!! He knew that he was married!