Los Angeles  - Actor/director Mel Gibson has flatly denied rumours of a romance with a Russian singer that was alleged to have prompted a 900-million-dollar divorce action from his wife of 27 years, Robyn Moore.

The tabloid reports surfaced after Gibson was spotted twice with a 28-year-old Russian singer named Oksana.

A source told the National Enquirer, "It may turn out that Mel's friendship with the woman is innocent, but Robyn warned him that if he embarrassed her one more time, their marriage is dead and buried."

However the New York Daily News quoted a spokesperson for Gibson as saying that the rumors of divorce and infidelity are "100 per cent untrue."

Gibson and Moore have seven children, ages 9 to 28. (dpa)