WWW- Rocker TOMMY LEE wrecked his seven-year marriage to actress HEATHER LOCKLEAR by sleeping with an adult film star on the set of a porn film.

In his new autobiography TOMMYLAND, the former MOTLEY CRUE hunk, who was also married to PAMELA ANDERSON, claims the bathroom sex session is one of the stupidest things he’s ever done. Lee reveals he ended up on the sex film set when porn star pal RON JEREMY invited him to see a XXX-rated film being made. He quickly befriended one of the stars of the film and made love to her in a bathroom.

Lee says, “That was the nail in the coffin of my marriage.”

Lee had hoped to keep the sex session a secret but he quickly found out porn stars love to gossip.