It looks like Borat is the reason behind the breakup of Pamela Anderson and Kid Rock’s less than four-month marriage. Pam screened the movie for Kid, in which she makes a cameo as herself with Borat throwing a bag over her head and chasing her around. She looks like she’s really bothered by the whole thing and is caught offguard, but word is she was in on the joke. Kid was so upset at her performance that he called her a slut in front of everyone. That’s pretty much when their really solid marriage broke down:

“Ron Meyer held a screening of ‘Borat’ at his house for a bunch of people, including Pam and Bob,” says an Anderson pal. “It was the first time Bob [Kid Rock] had seen the movie, and, well, he didn’t like it.”

The hugely popular film shows Sasha Baron Cohen – in character as Borat Sagdiyev – falling in love with Anderson after seeing her in a “Baywatch” rerun, then driving across America in order to propose marriage to her.

Her friend tells Page Six, “Bob started screaming at Pam, saying she had humiliated herself and telling her, ‘You’re nothing but a whore! You’re a slut! How could you do that movie?’ – in front of everyone. It was very embarrassing.

“Pam thought he could have a sense of humor about the movie. She was in on the gag from the very beginning and loved doing the movie. And on the eve of what was supposed to be a very positive thing, he made it an awful night.

“Ever since that night, it has been icicles between them,” the friend relates. “Bob is just a very unhappy and angry man. Pam is very disenchanted and sad. You know, there are reasons why she never married him before. Those reasons disappeared while they were together on a boat in St. Tropez, but she knows now that they never went away. The reality is he is an insecure, angry man….

“Pam is just very happy to not be in the same house with so much passive-aggressive hostility in it,” the friend adds.

My husband would be overjoyed if Borat stalked me and I made it into a movie. Kid Rock must have a real problem.