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Winehouse arrived at the dinner party, which was being held to celebrate the Olsen twins' new fashion label, and found her lover chatting with supermodel Lily Cole.
The 'Rehab' singer reportedly dragged him to a toilet cubicle before shouting and claiming he had been flirting.
A source told the Mirror: "Amy was shouting at him and asking him what on earth he was doing with Lily.
"Blake tried to explain, but Amy was having none of it. People waiting to use the loos were just standing there open-mouthed."
Talking about the cause of the row, they added: "Blake and Lily were chatting very intently for ages at the dinner table before Amy arrived.
"Amy went ballistic when she saw them together and dragged Blake to the toilet to confront him.
"They eventually papered over the cracks enough to leave together but Amy was seething. There is no love lost between her and Lily."
