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The fiercely private star, 51, never the less hid the nine-year-old's face behind a mask as the little one dressed as a character from David's book Space Boy.
The comedian, 48, admitted that they both thought 'it was time' to brainstorm ideas and build concepts having not worked together since their last comedy series Come Fly With Me.
The presenter, 47, was joined by her co-host Dermot O'Leary and guest Simon Cowell on Wednesday's This Morning as they discussed the ITV talent show.
The comedian, 51, had reportedly been spotted in the VIP Emirates First Class bar by fan Jamie McDonald, who was on a Dubai trip.
David Walliams cut a dapper figure on Friday as he did a reading at the Guide Dogs annual Christmas Concert at St Paul's Cathedral, London.