Music
Rex Features
Chambers co-wrote Williams tracks including 'Rock DJ', 'Millennium', 'Let Me Entertain You' and 'Angels'.
He has also penned material for Kylie Minogue, Beverley Knight, James Blunt and Anastacia.
"In a writing session with Guy Chambers!! Going great!" Una Healy wrote on Twitter.
The 'Forever Is Over' group previously revealed that they have also teamed up with Taio Cruz.
The Saturdays are yet to confirm whether the material is for their third album or a re-release of Wordshaker, which peaked at number nine in October.
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