TMZ has learned Tito Ortiz was just arrested for felony domestic violence at the home he shares with Jenna Jameson.
We're told when cops arrived at the couple's home in Huntington Beach, CA -- Jenna Jameson had "visible injuries."
We're told someone called 911 today at 9:53 AM and reported a "disturbance."
Tito is currently in custody and on his way to a Huntington Beach jail in Orange County, CA.
Tito and Jenna are not married -- but they have twin boys together.