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Quentin Tarantino and Robert Rodriguez's tour de force "Grindhouse" almost didn't happen because Rodriguez was banging his leading lady, Rose McGowan, and his wife of 16-years and mother of his 5 kids, found out.

"It was the worst-kept secret on the set. They were going off to his trailer, having meals together," our source said. "Rose thought some of the crew were treating her differently, and the attitude was, like, well what do you expect when you're [bleeping] the director?"

She and Rodriguez first met at Cannes in 2005. But until now the consequences of their shenanigans weren't fully known. When the director "fell in love with his femme-fatale star . . . he broke up his marriage of 16 years . . . The production had to shut down for a month while he recovered."

Can this movie get any better? Lots of killing, gore, sex, senseless violence and now on set tensions between co-stars, cheating, and divorce! I cannot wait to see this movie.

More pics after the jump!