They've just kicked off their first series on the judging panel of 'The X Factor', but Robbie Williams and Ayda Field will have their hands full in other ways over the next while, too.

The pair have announced that their third child has been born by surrogate after keeping the secret well under wraps for the last while.

Field revealed the news on Instagram, adding that their new daughter Colette (to be known as Coco) has been born. "It has been a very long and difficult path to get here, which is why we have kept it on the down low," she said. "Family comes in all forms, and this little lady, who is biologically ours, was carried by an incredible surrogate mother, to whom we will be eternally grateful."

Young Coco is a new sister for the almost 6-year-old Theodora (aka Teddy) and the almost 4-year-old Charlton (aka Charlie).