Mary Carey's still getting physical in her life after porn ... by getting in the ring and beating the pulp outta other celebs.
The famed porn star officially signed a contract with Celebrity Boxing promoter Damon Feldman -- who's arranged for Mary to slip on some gloves and go toe-to-toe with another chick on April 18 in Miami. Catfight!!!
Naturally ... the bout's going down at a strip club called the Booby Trap. We're guessing there will be no shortage of ring girls.
It's the first time Mary's stepping into the ring as a competitor, and CB's still working on finding an opponent for the retired XXX star.