LOS ANGELES – Porn queen Jenna Jameson filed court papers on Monday seeking legal separation from her husband of three years, fellow adult film star Jay Grdina, who headed the business venture she sold to Playboy Enterprises Inc. this summer.

The filing in Los Angeles County Superior Court, first reported by the celebrity Web site TMZ.com, comes months after Jameson, 31, whose real surname is Massoli, became romantically involved with mixed martial-arts champion Tito Ortiz.

Jameson and Grdina were married in June 2003 and have been estranged since July 1 of this year, according to the court filing, which cited irreconcilable differences as the reason for their split.

A legal separation involves the division of finances and assets while the couple remains formally married. Jameson and Grdina, who performs under the name Justin Sterling, have no children together.

A spokeswoman for Jameson said she and Grdina have appeared together in porn films produced for Club Jenna Inc., a multimedia adult-entertainment business she founded and later sold to Playboy.

As part of that deal, announced in June of this year, she and Grdina, who served as president of Club Jenna, both signed personal service agreements with Playboy. Club Jenna’s assets included a film production business, a video library, a network of Web sites and a DVD retail distribution outlet.

A spokeswoman for Jameson and Ortiz, 31, said Ortiz will seek to reclaim his light-heavyweight ultimate fighting title in a championship bout set for December 30 in Las Vegas. She said the pair have been dating for several months.