Katy Perry and Adam Lambert are among the stars who have contributed vocals to a new version of John Lennon's 'Imagine'.

UNICEF enlisted a host of famous faces to record a cover of the iconic track to celebrate the 25th anniversary of the Convention on the Rights of the Child.

Music stars Perry and Lambert appear in the song and its video, whilst there are also contributions from the likes of will.i.am, Nicole Scherzinger and Cody Simpson.

The song meanwhile will form part of UNICEF's #IMAGINE project.

They will invite the public to download an app and record their own lines to the song alongside the famous stars.

David Guetta will then create a multi-lingual version of the tune using the public's contributions.

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