Hollywood star couple Ashton Kutcher, 33, and Demi Moore, 48, and the former's alleged mistress, Sara Leal, 23, have been  conspicuous by their remarkable silence amid the media frenzy.

Now a party promoter identified as Gavin Naumoff has claimed to have arranged girls for Kutcher's wild party, held on the night of his sixth wedding anniversary, after which his rumored hookup with Leal took place.

Jacques Du Toit, a South African yacht worker, and a friend of Naumoff, said he witnessed the scene when he went to fetch his girlfriend, Alexis, who was partying naked with Kutcher in a hot tub in a suite at the Hard Rock Hotel in San Diego.

Alexis told him [Jacques] Ashton's room number, and when he got there, a bodyguard was at the door who said it was a private party. Jacques explained he was the boyfriend of one of the girls and was let in, Naumoff said, as he recalled what Jacques told him.

He found Ashton in a hot tub on the balcony with Alexis, Sara, a girl called Katie and another girl called Marta. They were all naked. Ashton invited Jacques to join them in the tub, Naumoff told the Daily Mail.

Naumoff also said that Kutcher yelled for vodka but had to get out of the tub to fetch some himself.

So Ashton gets out to get the vodka and that's when Jacques saw he was butt naked, he added.

Sara was telling everyone 100 percent that she and Ashton had sex, claimed Naumoff, continuing, Jacques and Alexis are two of my best friends and Sara is a good friend. If she says she slept with him then I think she's telling the truth.

Sara's a great girl. My job is to round up hot girls and bus them into clubs in San Diego or Vegas. The girls get free booze, food, whatever, and they attract rich and famous guys to the clubs. It's a two-way street. The girls get to meet rich men and the guys get what they want, Naumoff claimed.

She was off her head, we all were. She's a wild girl and loves to party. She is someone who knows what she wants and is determined to get it, he said, when questioned about topless photos of Leal that he is supposed to have.

Leal has not yet issued a statement about the rumors and has been reported to have gone into hiding, completely deleting her online existence. According to a friend quoted in some reports, Leal was freaked out when the affair was made public and sought a Hollywood lawyer's help to keep herself out of trouble.

Leal is reportedly preparing for a tell-all interview, provided she gets paid well for it. She could also be angling for a payoff from Kutcher.