Amy WinehouseAmy Winehouse’s marriage to Blake Fielder-Civil is said to be even more precarious than ever after the singer snubbed her husband on his 26th birthday on Wednesday.

Amy’s visit to HMP Pentonville in north London have been increasingly sporadic but she was expected to visit him for his birthday - but actually didn’t even send a card.

A source close to the Back to Black star told the Sun that Amy is living like “a single woman” but that she is unlikely to officially dump him while he remains in prison: “Amy does everything she can not to visit. She forgets she is married half the time.”

“There are a few men she is close to and Blake can’t stand it.”

Amy’s dad Mitch Winehouse added that a split wouldn’t be out of the question: “It wouldn’t surprise me if Amy and Blake had broken up.”

Blake was sent to jail on remand after being arrested on assault and trial fixing charges. He is expected to stand trial in June.