A Berry Royal Christmas is set to air in the United Kingdom on Monday, 16 December.
The official Instagram account for the royal couple posted several pictures of what the public can expect from A Berry Royal Christmas. It was this party that was photographed by Mr Porteous.
In another segment, Duchess Kate took Berry to Royal Horticultural Society (RHS) Wisley to see the third "Back to Nature" garden she designed, which promotes the importance of the great outdoors for children, per People.
The sneak peak came after the duchess stepped out in an olive-green, belted dress alongside husband Prince William to meet Tusk Awards nominees at a tea hosted by Kensington Palace last week. As she cooks, the Duchess and Duke of Cambridge also will step in to lend her a helping hand.
Furthermore, you know, my grandma turning out to be Queen at an extremely youthful age, in the days when it was a keeps an eye on world, it was exceptionally hard for her to have any kind of effect.
'And, you know, my grandmother and my grandfather together are the epitome of public service'.
Each year, workers and volunteers of organizations and charities that help the needy during Christmas do not get to prepare a huge festive meal with their loved ones. I find that you hear and you understand and you learn so much more by giving a bit of your time, a bit of your day, to just be around'.
William also gave a special mention to his late mother Princess Diana for paving the way through her work for the homeless as well as tackling the stigma around aids. Chatting to Ms Berry on the London centre of The Passage, a homeless charity of which he's patron, he says: 'Growing up, both of my parents were hugely charitable.
The 37-year-old said: "My father set up the Prince's Trust". He's involved in so many different organizations. He said he considers himself lucky for having grown in a household that gives back. "It will be truly special to see the causes so close to their hearts, as well as to hear all about the awesome support these charities provide".