Just two days after the long-awaited Amy Winehouse biopic premiered at the Cannes Film Festival, the late singer's ex-husband has spoken out about his relationship with the star.

Amy married Blake Fielder-Civil in 2007, and the pair divorced two years later. However Blake now alleges that his ex-wife never wanted a divorce, and that her signature on the divorce papers was "clearly" faked.

"There was a manic insistence from her family and friends to sign the divorce papers," Blake told The Sun.

"[Amy and I] spoke on the phone and she didn’t want the divorce. A week later the papers were there in front of me and it was clear it wasn’t her signature," he added.

Blake says he didn't speak up about his suspicions until now as he knew Amy's family wanted her to go ahead with the divorce no matter what. "I was so eager to get it over with and prove I wasn’t after her money, as her family kept saying, so I signed it," he explained.

Former drug addict Blake says he believes it was "months" before the Back To Black singer even knew the pair were officially divorced. Amy died in 2011 from accidental alcohol poisoning, aged just 27.

Blake has openly admitted that he was the one who introduced Amy to crack cocaine and heroin, leading to a hard drug habit she constantly struggled to kick.

Amy's family have already slated film director Asif Kapadia for his "misleading" portrayal of Amy's life in the new biopic, though the director said he worked hard to ensure the film was objective.

Speaking about the film, Blake said, "The only one who should come out well is Amy. We are all to blame because at the end of the day, a beautiful, rich, successful young woman has passed away."