Avril Lavigne has pushed back her album release because she can't work with her former husband.

The 'Girlfriend' singer – who filed for divorce from Sum-41 rocker Deryck Whibley in October last year – is reportedly struggling to finish her new album 'Pink Crust', because he is producing the record and their split is causing tensions in the studio.

A source told the Toronto Sun newspaper: 'The uglier it gets in court, the uglier it gets in the studio. The first eight songs, Avril and De...