Are Amy and Blake on the rocks?

Could Amy Winehouse and her husband Blake Fielder-Civil be heading for divorce?

A recent sighting of the pair engrossed in a fierce argument has stirred rumours that the once smitten husband and wife could be forced into a marital separation.

The couple were seen fighting in the London department store Harvey Nichols after Amy spotted her man talking intensely with British supermodel Lily Cole.

"Blake and Lily were chatting very intently for ages before Amy arrived," a source told the Mirror.

"Amy went ballistic when she saw them together and dragged Blake to the toilet to confront him. They were arguing for at least 20 minutes. Amy was shouting at him and asking him what an earth he was doing with Lily.

"Blake tried to explain but Amy was having none of it. People waiting to use the toilets were just standing their open mouthed. Their marriage is hanging by a thread."

Lonely and don't want to be?