Violet Kowal: Polish porn filmmaker claims affair with Mel Gibson

mel-gibson-gi.jpg Billy Crudup, Tiki Barber, David Boreanaz ... And it looks like we may be able to add Mel Gibson to the list of celebrity men who cheat on their pregnant partners.

While Mel's break-up with the mother of his 8th child, Oksana Grigorieva, last month didn't really surprise anyone, it was definitely sudden. And now the National Enquirer says it knows what -- or more precisely, who -- the cause was.

Reportedly, Violet Kowal, a 26-year-old porn filmmaker from Poland (either an actress or producer depending on the source) has told the magazine that she and Mel had sex eight time at his Malibu home and Santa Monica office last year.