Amy Winehouse has reportedly branded Pete Doherty's songs "s**t", throwing their duet plans into doubt.

'Rehab' singer Amy has been working with the Babyshambles rocker since he left prison last week but has been unimpressed with his musical efforts.

A source told Britain's Daily Mirror newspaper: "Pete's really struggling to get it together. It hasn't clicked yet. Amy has thrown back every song Pete has written for her. She keeps telling him they're rubbish, and worse, and she'll only perform if the song is great. When she's in the studio she can be ruthless and doesn't care about hurting people."

Pete and Amy have been spotted together nearly every day since the former Libertines star got his freedom back.

Amy started work on a number of tracks with Pete's Babyshambles bandmate Mick Whitnall while the 'Killamangiro' singer was still in Wormwood Scrubs Prison.

The pair intended to meet up earlier this week for a jam at the Jazz After Dark venue in London's Soho, but by the time they arrived at the venue, 2am, it had closed.