TINSELTOWN SPYWITNESS.

Byline: Elizabeth Snead and Jennifer Sklar

WHAT HAPPENS HERE, STAYS HERE: Where else but Las Vegas would you find go-go-dancers gyrating in a swimming pool at 4 a.m.?

The launch of Vegas magazine, held at the oh-so-hot Rain dance club at the Palms casino and hotel Thursday night, brought out the celebs, Vegas movers and shakers, a few ``Real World'' cast members and, of course, the dancers.

``It's always a party in Las Vegas, 24 hours a day,'' said actor Michael Clarke Duncan, who trekked from L.A. to Sin City for the launch party. ``And I am a confirmed bachelor, so I am just hanging out and making the rounds.''

A lot of people seemed to be doing just that, as swarms of guests hovered around everyone from Pamela Anderson to ``Real World Paris'' cast member Christina, who is from Vegas. The fledgling star was enjoying every moment of her newfound fame, even jumping into the arms of a group of Chippendales dancers at one point.

Comic Rita Rudner, who has a nightly show at the New York New York hotel on the Strip, promises she started the trend of Hollywood-to-Vegas sojourns. ``I live in Las Vegas and work here, too,'' she said. ``Then Celine Dion had to go and copy me.''

There was no sign of the Canadian crooner, who is slated to perform nightly at Caesars Palace for the next few years, but ``That '70s Show'' star Wilmer Valderrama was milling about. He yelled his number out to society's favorite socialite, Paris Hilton, who hung on every word that came out of 'N Sync member JC Chasez's mouth at Ghost bar later in the evening. After Hilton grabbed the digits and fled, Valderrama looked slightly perplexed. ``I should have gotten her number instead!'' he told his friend. Only in Vegas.

PIRATE PARTY: ``Sinbad: The Legend of the Seven Seas'' debuted Sunday at a scaled-down daytime premiere in Century City, complete with stuffed toys in the gift bag but, alas, no Brad Pitt. The hunky star lends his voice to the animated hero and has a primo supporting cast behind him, including the voices of Michelle Pfeiffer, Catherine Zeta-Jones, Dennis Haysbert and Joseph Fiennes. The film opens Wednesday.

Fiennes admitted it was a little strange working with such high caliber actors without actually meeting them. Each actor spends days on end alone in a box, trying to match his or her voice to each scene's action.

``You think you are going to work with these great actors and you don't even meet them until the press junket!'' said Fiennes, who plays Pitt's best friend in the film. ``But it was a great experience, and now my nieces and nephews will be excited.''

Blair Underwood brought his family and said he anticipated making a run to the toy store for all the Sinbad loot. ``This is just one out of three,'' he said, pointing to his adorable son. ``I am sure they will want everything!''

Also stepping out for the premiere were DreamWorks honcho Jeffrey Katzenberg, ``American Dreams'' stars Brittany Snow and Vanessa Lengies, Jonathan Lipnicki and ``Oliver Beene'' star Daveigh Chase.

REEF MADNESS: It was pretty easy finding Nemo at the ``Coral Reef Adventure'' premiere Wednesday night at the Universal City IMAX.

The little clown fish and all his finned friends were among the underwater stars of a spectacular film, which opens in L.A. next January, about the coral reef crisis.

The premiere was part of a fund/awareness-raiser for UCLA's Reef Check, an organization that monitors, restores and maintains coral reef health. Supportive stars Nastassja Kinski, Linda Gray, Ed Begley Jr., Colleen Camp and Steve Valentine were on hand to praise director Greg MacGillivray's film.

``Adventure'' tracks ocean adventurers Howard and Michele Hall's dives to investigate the destruction of coral reefs, known as ``underwater rain forests.''

``When I first discovered the vast (colorful) universe under the sea, I was forever changed,'' said Wendie Malick, the gala's environmentally active hostess, who first learned to snorkel in 1970. She thinks ``Adventure's'' deep-sea beauty will make viewers young and old visit www.reefcheck.org to find ways to help save the seas and the planet.

Malick, clad in a clingy, colorful Kenzo dress, admitted she hasn't seen that other inspirational oceanographic odyssey, ``Finding Nemo.'' But she had been deeply influenced by ``The Italian Job'' and its thrilling Mini-Cooper car chase scenes.

``I finally got rid of my gas-guzzling SUV,'' Malick admitted. ``But I just couldn't do one of the hybrids so I bought a Mini and I love it. I need to have fun when I drive.''

A silent auction of ``Titanic,'' ``Gangs of New York'' and ``Catch Me If You Can'' books and film posters donated by Reef Check volunteer/activist Leonardo DiCaprio (filming a new movie and unable to attend) went fast at the film's after-party. Even a ``Nemo'' poster and stuffed clown fish went for several hundred dollars.

CAPTION(S):

4 photos

Photo:

(1) NIKKI, left, and PARIS HILTON, with DUNCAN: Room service.

Denise Truscello/WireImage.com

(2) VALDERRAMA: Call me anytime.

(3) FIENNES: Vocal hero.

(4) MALICK: Now SUV-free.

Mike Guastella/WireImage.com