Lily Allen was an Atomic Kitten

LILY ALLEN provided backing vocals for an Atomic Kitten song when she was 14-years-old, it was revealed today.

Sources said Allen lent her voice to the theme tune for 2001 film Mike Bassett: England Manager.

It was reported that the girl group's vocals were not not strong enough for 'On Me 'Ead', so songwriter Keith Allen - Lily's father - requested that his daughter stood in.

A source said: "When the Mike Bassett soundtrack was put together, the deadlines were really tight.

"The producers didn't have time to spend a week in the studio getting the girls' vocals sorted, plus Natasha never turned up because she was ill, so there was a panic."

They added: "Keith said to give [Lily] a try because he thought she had a good voice. Sure enough, everyone was astounded by how good she was.

"It only took her half a day to nail it. Liz and Jenny are on the finished song but Lily was the third member, with the strongest vocal, patching the whole thing up."