The Princess of Wales has been out of the public eye for some months, with the official explanation being abdominal surgery.
A photo sent out on Sunday (UK) by Kensington Palace of Princess Kate and her three children has been retracted by four photo agencies.
The agencies say the image does not meet publication standards due to concerns the photo has been manipulated.
It's a very high profile instance of sorting truth from fabrication in the digital world, in what psychologist and AI commentator Paul Duignan calls a 'trustability crisis'.
He joins Emile Donovan from Wellington.