Tito Ortiz Has Been Arrested For Beating Up Jenna Jameson

Ultimate Fighting gorilla TITO ORTIZ was arrested yesterday morning for allegedly beating up his girlfriend . . . former mattress actress JENNA JAMESON . . . at their home in Southern California.

--Details on the attack itself are scarce. Jenna reportedly told police Tito "threw her down." She was also seen later in the day wearing a sling on her right arm. She said she suffered ligament damage.

--TMZ cameras got to the scene as Tito was being led into a squad car with his hands cuffed behind his back.

--He denied putting his hands on Jenna, and apparently tried to be cute by telling reporters that he was only going with the cops because, quote, "I'm gonna show 'em jiu-jitsu."