Wearing a Fendi fur wrap and silver dress with a plunging neckline, Sharon said: "I want you to know that I love this necklace. We usually sell a piece of something and it's usually a piece of me!"
She told one bidder: "Don't flirt with me and not mean it, you know I hate that. I love that quiet talk but I can't quite hear you."
Sharon asked the guests, which included model Eva Herzigova, director Sofia Coppola and actress Mira Sorvino, to bid for contemporary art and De Grisogono jewellery.
When one person refused to raise his bid, she jokingly warned him: "I'm going to come over there and slap you!"