Blake: Winehouse Cheated? I Wanna Divorce

Things really are looking up for Amy Winehouse -- her junkie, jailed husband wants a divorce.

Blake Fielder-Civil's lawyer, Henri Brandman, told us he's getting the wheels turning on divorce papers. Amy has been spotted hooking up with a 21-year-old dude while vacationing in St. Lucia, according to the Daily Mail.

Amy just admitted in an interview that she's "forgotten I'm even married" and that their "whole marriage was based on drug use."