Amy Winehouse's marriage in tatters

Amy Winehouse's marriage is close to breaking point after she neglected to visit husband Blake Fielder-Civil in prison on his 26th birthday.

The troubled 'Rehab' star, 24, did not visit Blake in London's Pentonville prison on Wednesday or send a card in time.

Those close to the singer say she is living life as "a single woman" but will not dump Blake while he's locked up.

Blake -- who is currently on remand awaiting trial on charges of perverting the course of justice and assault -- is self-harming because Amy keeps missing prison visits.

A source said: "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, said last night: "It wouldn’t surprise me if Amy and Blake had broken up."