KIM KARDASHIAN OFFICIALLY THREATENS TO SUE OVER CHEATING ALLEGATIONS: KIM KARDASHIAN has officially threatened to sue New England Patriots safety BRET LOCKETT if he doesn't stop saying he hooked it up with Kim and take everything he's said back.

Kim's attorney sent a letter to Bret's rep saying, quote, "To put it very plainly and clearly, and as Mr. Lockett knows, there is not now, and never has been such a relationship. Ms. Kardashian does not know and has never even met Mr. Lockett."

In other Kim K. news ... she isn't just trying to protect her reputation, she's trying to protect her fortune from fiance Kris Humphries.

Kim is putting the finishing touches on a prenup with the help of her mother, according to "Us Weekly". As for specifics, their insider says, "Kim's Beverly Hills home and all of her assets are protected. She keeps anything she earns during the marriage. He does not receive anything if the marriage fails."

The groom-to-be, who makes $3.2 million a year playing for the New Jersey Nets, doesn't seem to have a problem with the agreement.

THERE APPEARS TO BE A LEANN RIMES SEX TAPE!!!: According to the not-always-reliable "Star", there's a LEANN RIMES sex tape floating around that was filmed a couple of years ago when she was still married to Dean Sheremet.

There's no word who has possession of it, but it's not LeAnn because according to reports, she's doing everything she can to stop it from coming out. Dean isn't exactly denying the tape exists, telling "Star", quote, "Things like this happen. We were married for eight years, we did a lot of [stuff]!"

LeAnn, however, is issuing a public denial through her spokesperson who said, quote, "LeAnn has absolutely never filmed a video having sex."

As far as the naughty content of the tape ... seems like Dean was mostly manning the camera and LeAnn was the star. She's wearing a thong and, quote, "bending over in front of the mirror". She's also, quote, "doing other things".

I've said it before and I'll say it again: DON'T take a photo or make a tape that can eventually be seen by your parents, kids, co-workers, whomever. It's just ain't worth it.

MARC ANTHONY WALKS OUT ON INTERVIEW: MARC ANTHONY walked out on a Univision reporter after the reporter would not drop the issue of JENNIFER LOPEZ'S sex tape.

The reporter kept asking him about the scandal despite Mark's repeated "Next question" reply. After Mark's publicist tried to stop it and the reporter persisted, Mark got up and walked out.

Watch it now

MORE PROOF ARNOLD IS SCUM: Still not convinced "The Sperminator" is a sleazebag? Check out what "So You Think You Can Dance" judge MARY MURPHY told JOY BEHAR on her show ...

Mary revealed witnessing ARNOLD SCHWARZENEGGER'S womanizing ways firsthand. "He...hit on my makeup artist in two seconds," she told Joy. "Two seconds in an elevator. That's all it took. The door shut, the two of them in there, and he leans down and says, 'Do you want to kiss me?'"

"I mean can you imagine on a daily basis how many women...he has hit on," she adds. "This is somebody he'd never seen before."

In somewhat related Joy Behar/Political Scandal news … Check out what BARBARA WALTERS had to say on “The View” about the current Weiner-Gate twitter scandal. Apparently Barbara is a size queen!!! … LISTEN HERE

CELEBRITY BIRTHDAYS: Estée Lauder covergirl ELIZABETH HURLEY blows out birthday candles today. Here's the rest of Friday's bday list.

NICOLE SCHERZINGER SHOWS US HER TWEETS: Pussycat Dolls NICOLE SCHERZINGER tweeted a photo of herself and PAULA ABDUL with the caption, "A dream come true! I was & always will be her biggest fan! I can't believe I get 2 work w/ Paula. X Factor day 1!"

If lack of chemistry was truly the reason behind Cheryl Cole's exit from The X Factor -- it looks like producers made the right move by replacing her with Nicole .

CELEBRITY CRIME - ESTELLA WARREN: Estella Warren was formally charged yesterday with DUI, hit-and-run driving, assault on a police officer and resisting arrest.

"The Planet of the Apes" star was busted May 23rd after crashing her Prius into three parked cars in Hollywood. She allegedly resisted arrest and then tried to escape after being brought to the police station. If convicted on all charges, she faces a total of two-and-a-half hours years in jail.

(--RadarOnline interviewed a guy who gives a pretty detailed description of exactly what happened. You can read it here if you'd like.)