HOLLYWOOD megastar Tom Cruise is furious royal biographer Andrew Morton is using a gay porn actor to investigate his private life. […]Morton, who collaborated with Princess Diana to produce an account of her troubled life, is paying 58-year-old Paul Baressi to help him with his warts-and-all book about Cruise.

Baressi has starred in 25 gay porn films but now works as a private investigator in LA.

“I am a key source of information regarding several things,” Baressi said.

Baressi claims to have provided Morton with documentation regarding a bizarre episode in which Cruise, 43, was falsely accused of having a homosexual encounter while shooting the film Eyes Wide Shut in the UK.

Yesterday Cruise’s lawyer Bert Fields said the actor would sue Morton and New York-based publishers St Martin’s Press if they used the letter he wrote in response to try to cast aspersions on Cruise’s sexuality.

“I wrote a letter to Mr Morton back in November and said he obviously was entitled to write the book but ‘make sure you check your facts’,” Mr Fields said. “If he tries to use my letter to create the impression that Mr Cruise did have a gay affair, we will certainly sue … because the story is false.

“Mr Cruise is not gay.”

There you go. The man ain’t gay. His lawyer said so.

Bridget Jones is untying the knot. Renee Zellweger, who played the lovelorn Brit in “Bridget Jones’s Diary,” and country music star Kenny Chesney will have their four-month-old marriage annulled, Chesney’s publicist, Holly Gleason, and Zellweger’s Los Angeles-based publicist Nanci Ryder, confirmed to The Associated Press on Thursday.In court papers filed Wednesday, Zellweger listed “fraud” as the reason for the breakup but did not elaborate.

A phone call to her attorney was not immediately returned, nor was a call to Gleason later in the day regarding the fraud claim.

I think someone spent their honeymoon digging in the closet… and got lucky.

But this being Hollywood and all, he probably never will:

It seems that Saw is turning into a horror for Cary Elwes‘ bank account.

The blood-soaked movie, which also starred Leigh Whannell, Danny Glover and Monica Potter, was made for just $1.2 million but grossed a whopping $102.9 million worldwide and has been a solid seller on DVD. Elwes says he’s gotten peanuts for his efforts while his costars have made millions, and he’s taken his beef to the courts. […]

Elwes claims he was promised “favored nations” status among the cast and was guaranteed at least 1 percent of the producers’ net profits. He also alleges that, during a September 2004 press junket for the film, producer Mark Burg told Elwes he “would make more money [on Saw] than he had ever made before.”

Alas, he has not. Elwes says he only received a salary of $2,587.20 for his work on the film followed by a $53,275 bonus. […]

The suit claims that Glover is getting 2 percent of gross profits, while Potter has banked more than $250,000 in additional compensation.

Lawyers for the defendants aren’t buying Elwes’ argument. Attorney Martin D. Singer told the Los Angeles Times that the suit “clearly has no merit” and points out that Elwes was never forced to make the movie.

Another actor gets to ride the Hollywood “net profit” donkey.

Giddy up, Cary!

Ring in a new round of “pass-the-buck” as “The Island”s blame shifting continues full force.

It’s always funny how producers try to dodge the box-office bomb bullet, but end up with some sticky stuff dripping down their faces:

The star [Scarlett Johansson] is mad as hell at the husband-and-wife producing team of Walter Parkes and Laurie MacDonald because, as PAGE SIX reported last week, they faulted her and co-star Ewan MacGregor’s lack of star power for the movie’s flop. Parkes went as far as to tell zap2it.com, “Even lesser television actresses, quite honestly, would have more connection to that audience.”

Now the gloves are off, and insiders on the picture are blaming the producers rather than the two young stars.

We’re told that Parkes and MacDonald “were only on the set three times” and that they spent three weeks in June, right before the movie’s release, on vacation in Italy, where they were “basically uncontactable.”

Sources also tattle that director Michael Bay delivered a final print of “The Island” only two days before the press screening and that during a meeting in April at Parkes’ office, DreamWorks publicity chief Terry Press admitted, “I have no idea how to market this movie.”

A spokesman for Johansson tells PAGE SIX’s Tom Sykes, “We find it incredible that the producers of ‘The Island’ have blamed the low box-office results on the film’s two lead actors. This is a clear-cut example of the producers’ passing the buck and not taking responsibility for their part in making calculated mistakes throughout the film’s marketing.”

The rep continues: “Ms. Johansson is proud of her performance and the film… The film and the actors’ performances were overall well received by the critics. We put our trust in the professionals who sold and promoted this film. It is unforgivable that the producers continue to blame everyone but themselves.” […]

Parkes and MacDonald ate their words as PAGE SIX went to press, praising “Scarlett Johansson and Ewan McGregor’s extraordinary work” and alleging that their “comments were taken completely out of context.” DreamWorks had no comment.

Makes me wonder what Steven Spielberg was doing during this clusterfuck.

Oh, that’s right, he was chasing after Kooky Cruise.

PR stunts are not what they used to be.

Gone are the good ol’ days when stars would get hitched on the Eiffel tower before a scheduled press conference or jump on daytime talk show couches to lend credibility to their futile efforts.

Sigh. Yeah, those were the days…

Despite what you may have read, Hollywood bottom feeder Mitch Mortaza is not dating Lindsay Lohan.

For the past several weeks, some apparent associates of Mortaza�party promoters linked to the Cabana and Spider clubs in L.A.�have been e-mailing “exclusive tips” to various publications chronicling a tumultuous romance between the teen queen and the 31-year-old TV producer. Several of the tips have been printed nearly verbatim. None of them appear to be true.

Lohan’s rep, Leslie Sloane, says the starlet doesn’t even know him: “I’ve got tabloid reporters calling me every day with these same items, saying they heard he was seen outside Cartier buying her a ring�all from the same source. She’s not dating him. There is no way they are together. She’s in Long Island with her family and will be returning to L.A. in ten days. I think Mitch needs to get a life.

Or a better PR rep.