arniemaria.jpg Celebrity biographer Ian Halperin's new book "The Governator" alleges that Arnold Schwarzenegger had a fling with a model while partying at the Playboy mansion, and get this -- Hugh Hefner may even have a videotape of the incident!

An unnamed female source who attended the party told Halperin, "There's a rumor that Hef has video, for security purposes, of everything that goes on in those rooms. I hope that tape comes out so his wife can see what kind of a pig he is."

The source also recalls the first time she saw the California Governor at a bar in Santa Monica back in 2006, and she says, "Arnold was all over us trying to get us to go home with him. He plied us with alcohol and kept making the moves on us all night. He came across as a big pervert."