KATE MOSS BDAY ORGY !

KATE MOSS celebrated her 34th birthday with a sleazy orgy involving THREE other partygoers

The catwalk queen got hot and sweaty with two female models and a lucky male guest while a crowd of onlookers snorted cocaine and ogled the eye-popping performance.

Kate gasped with pleasure along with the professional female models and stocky fella in her £2,500-a-night suite on the eighth floor of London's Dorchester hotel.

Kate's boyfriend JAMIE HINCE was in the other room during the orgy, but his band THE KILLS' new album, No Wow, was her choice of CD to set the mood in the master bedroom.

A fellow party guest who witnessed the four-in-a-bed romp, told me: "Kate was loving the attention from the girls, the bloke—and the crowd. It was standing room only.

"They were all over each other but it was her night."

It's a saucy echo of Kate's infamous The Beautiful And The Damned birthday bash four years ago which ended up in a no-holds-barred orgy involving Kate's fashion friend SADIE FROST and other party guests.

My insider, who was present at Wednesday's 18-hour birthday celebration, revealed that the orgy was already in full swing by 3am, when Kate arrived at the room.

Earlier she had been out at the Punk nightclub enjoying the company of her celeb guests, who included BOBBY GILLESPIE, DAVINIA TAYLOR, KELLY OSBOURNE, DAVID WALLIAMS and RONNIE WOOD.

My source said: "Kate kept disappearing into the toilets with her friends for giggles and girly chats. She was full of energy that night."

And she certainly needed it to continue the party back at the Dorchester with some of her pals—where musical chairs wasn't on the agenda.

"Security was watertight," revealed my source. "Nobody made it through the suite doors who wasn't already on a pre-approved list. Once you were inside it was obvious why.

"People were doing cocaine all over the place. They were chopping out line after line on the expensive furniture and snorting it up. The lights were low and there were scented candles all over the place.

"When Kate arrived, she reached for a Diamond Chaser—a cocktail of vintage champagne and cognac—and made her way to the master bedroom."

Inside another party was under way—a steamy romp between two stunning models and a male partygoer.

The source explained: "The three of them were kissing and caressing one another and about four or five other people were in the room watching."

Birthday girl Kate pushed through the gathering and sprawled on the bed—and the three partygoers pounced on her.

"They teasingly took it in turns to snog each other," added the source. "Then the kissing became fondling and everything except full sex followed. Once word got out, everyone was desperate for a peep of Kate."

By sunrise an exhausted Kate headed to a pal's pad in north London before returning to her new £8million home in St John's Wood at 8am.

It was the end of 18 solid hours of partying—falling short of the planned 34, one hour for each of Kate's 34 years.

And in that time Kate and her pals guzzled a lot of booze. The bar bill for the Dorchester alone was a whopping £35,000, thanks mainly to 14 bottles of vintage champagne, four bottles of vodka and 17 Bellini cocktails.