Bash by Beacher a Paris par-tay

If this was Jeff Beacher's last hurrah in Las Vegas, he left 'em collapsing in laughter.

Assembling what he called his best-ever cast of "Madhouse" characters, Beacher teamed up with the Hard Rock Hotel to throw a wild birthday party Saturday for his pal Paris Hilton, who brought her new beau to town.

Playing the ringmaster to the end, Beacher looked like he commandeered a circus.

On hand: eight 400-pound female go-go dancers, a 12-member marching band of TV show mascots, a mini-Britney, Michael Jackson, Elvis, Pee-wee Herman and Tina Turner looka-likes, robots, a Borat look-alike (in a regular suit, not in his mankini, thankfully), Teletubbies, a towering "Iron Man" and especially for Paris, who loves pink, a crew of pink Oompa Loompas. There was even a miniature goat wearing a pink tutu being tended by one of Beacher's ubiquitous little persons.

During the wall-to-wall bash, which went until dawn Sunday, in the Hard Rock's bowling alley suite, comedy magician Nathan Burton put Hilton on a table, covered her with a box and pulled a lever that sent 28 spikes "through" the heiress, who turned 28 on Feb. 17.

The finale of a weekend-long birthday celebration, the party was "the best I've ever thrown," said Beacher, who flies to Louisiana tonight to join two busloads of "Madhouse" members on a tour.

Hilton had film crews taking it all in for a sequel to her reality show "My New BFF." She's coming back soon to shoot more.

Whether her new boyfriend, Doug Reinhardt, the latest of her long succession of revolving-door romances, lasts that long is another matter.

An aspiring 23-year-old actor who had a short-lived pro baseball career, he has been among the roster of D-list celebs being paid appearance fees to host at several Las Vegas nightclubs.

THE SCENE AND HEARD

Encore headliner Danny Gans has a cameo in the new film "Race to Witch Mountain," starring Dwayne "The Rock" Johnson as a Las Vegas cabdriver who picks up a pair of siblings with superpowers. The 1975 original, "Escape to Witch Mountain," co-starred Eddie Albert, Ray Milland, Denver Pyle and child star Kim Richards (Small world department: Paris and Nicky Hilton are her nieces). Richards and Ike Eisenmann played a pair of orphans with psychic powers who were trying to reach Witch Mountain.

Gans' scene in the new movie, which comes out Friday, involves fans recognizing him in a casino.

SIGHTINGS

Is "CSI," the Las Vegas version, back in town for more filming? Marg Helgenberger was seen at the Palazzo on Sunday ordering a large iced, nonfat cappuccino at Coffee Bean & Tea Leaf. She attended Cher's show Saturday at Caesars Palace. Helgenberger, 50, and her husband, Alan Rosenberg, president of the Screen Actors Guild, announced in December they were splitting after 19 years. ... Actress Brittany Snow, with boyfriend, film producer Ryan Rottman, and girlfriend "90210" star Jessica Stroup, continued her weekend birthday celebration on Saturday with dinner and cake at Tao in The Venetian. Snow will be appearing in the just-announced "Gossip Girl" spinoff. ... Olly Girl and former "Sunset Tan" reality starlet Molly Shea on Saturday celebrating her 23rd birthday at Tabu Ultra Lounge in MGM Grand. ... Cast members of "Greek," the ABC Family network's drama series about college fraternity life, partying it up both Friday and Saturday night at The Bank in the Bellagio. They included Aynsley Bubbico, Tiffany Dupont, Dilshad Vadsaria and Amber Stevens. ... At Simon at Palms Place on Sunday: University of Nevada, Las Vegas coaching legend Jerry Tarkanian. ... At Poetry in the Forum Shops at Caesars on Saturday night: Super Bowl MVP Santonio Holmes of the Pittsburgh Steelers, Miami Dolphins star linebacker Joey Porter, rapper Too Short, and MTV stars Corey Holcomb and Spanky Hayes of "Wild 'N Out." ... Masiela Lusha, who plays Carmen on George Lopez's sitcom, dining with her husband, Sean Lorty, at Trader Vic's on Saturday.