Amy Winehouse's husband asks for a divorce -- again

Amy Winehouse's husband has again asked the troubled star for a divorce.

Blake Fielder-Civil -- who's currently locked up in London's Pentonville prison on assault and conspiracy charges -- has demanded an end to the marriage after becoming jealous of the singer's relationships with other men.

A source said: "He is upset how close she has been getting to some of the men in her life.

"He thinks she’s messing around. He's upset she never visits him and told her a few days ago he wants to end their marriage and she must visit him immediately to discuss it."

The 'Rehab' star, 24, spent a week in her North London London pad with some male pals before emerging on Monday.

She then went to Pentonville jail for the make-or-break showdown with Blake.