"A Berry Royal Christmas" will air on December 16, at 8.30pm on BBC1.
In the show called "A Berry Royal Christmas", due to be screened on BBC One on December 16, the celebrity cook joined William, 37, and Kate, 37, on a number of royal visits. The two will be seen preparing festive food for the staff and volunteers of these charities. It was this party that was photographed by Mr Porteous.
The BBC special, A Berry Royal Christmas, sees the former Great British Bake Off presenter (centre), who has written more than 75 cookery books, join the Duke (left) and Duchess of Cambridge on several Royal engagements.
Their visit to The Passage - which is the UKs biggest asset community for destitute and shakily housed individuals - established William's deep rooted association with the philanthropy, which he chatted with his mom in 1993.
Speaking to Hello!, a source told how cameras captured several "heart-warming" conversations between Kate and Mary, 84, that give an insight into the Duchess's nature.
"And you know, my grandmother became Queen at a very young age, in the days when it was a world of men, it was very hard for her ... to make a difference".
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In a BBC special next month, Mary Berry along with the royal couple, William and Kate, will be preparing well-loved Christmas treats for these special volunteers.
During the one-off episode, Prince William reportedly spoke of the importance of philanthropy and generosity that his grandmother, Queen Elizabeth, and parents, Prince Charles and Princess Diana, both personally exemplified and instilled in him since childhood.
"In their own unique and distinct way, and you know, my grandmother and my grandfather together are the epitome of public service".
What's more, I for one get a ton out of helping individuals.
"My father created the Prince's Trust".
I find that you hear and you comprehend and you adapt a great deal more by giving a touch of your time, a touch of your day, to simply be near. He's invested in so many different organisations. He said he considers himself lucky for having grown in a household that gives back.
Also during the special the Royals will be highlighting some of their favorite causes and charities.