On Sunday the Kensington Royal Instagram account shared that their royal highnesses with be joining the former Great British Bake Off judge to prepare festive food to thank all those working and volunteering over the Christmas period.
A Berry Royal Christmas is set to air in the UK on Monday, 16 December.
In the show, William, Kate and Mary will be joined by special guests including Great British Bake Off winner Nadiya Hussain as they prepare food for the festive party.
The programme will also see the royal couple take Mary to the charities they support where she will learn more about what they do.
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