Cameras also followed William and Mary on a secret engagement to homeless charity The Passage last month, and on a secret visit by Kate and the TV star to The Brink in Liverpool - the UK's first dry bar - days later.
William, 37, was shooting "A Berry Royal Christmas" for BBC1 in which he visits philanthropies with Mary, 84.
The Duke and Duchess of Cambridge have joined forces with cookery legend Mary Berry to prepare festive food?? to thank all those working and volunteering over the Christmas period. They dedicate their time and effort to provide the homeless and the needy with the help that will make their Christmas celebration more meaningful.
In November Kate had a meeting with BBC bosses about an upcoming project, could this be it?
As she cooks, the Duchess and Duke of Cambridge also will step in to lend her a helping hand.
We Finally Know When Doctor Who Will Return
The two-parter on January 1 is called Spyfall , with Jodie Whittaker reprising her role as the Time Lord for her second series. Tickets and a list of participating locations will be available beginning Friday, December 6 at the Fathom Events website .
Here are some of Vodafones Black Friday Deals on the latest smartphones
These offers last until Black Friday Deals Week, which sees new deals being added hourly through Cyber Monday. This year shoppers can expect Amazon to offer deals on big ticket items for up to a week after Cyber Monday.
Shelley Morrison Dead - 'Will & Grace' Actress Dies at 83
Morrison was also known for her work on The Flying Nun , where she co-starred as Puerto Rican nun Sister Sixto. Following the news of Morrison's death, her Will & Grace co-stars took to social media to remember her.
Ms Berry stated: 'I am honoured the Duke and Duchess invited me to join them on their charity engagements. They will also be meeting several people whose lives have been changed for the better by volunteer programs and the people behind them. Importantly, Nash revealed that Duchess Kate will be joined by her husband, Prince William, on the show. This collaboration with Mary Berry to highlight the contribution of the volunteer sector truly reverberates the Christmas spirit of giving and sharing.
The TV special also sees Prince William praise the work of his grandmother the Queen.
The royal dad of three told Berry how he witnessed both his parents do their charitable works, saying, "My father, Prince Charles, has set up the Prince's Trust". He is involved in so many different organizations. My mother has done her work with homelessness and, as you said, AIDS and other charities, and I think I've grown up in a household which has been very much a case of "well, we're very lucky - you must give back".
'My grandmother becoming Queen at a very young age, in the days when it was a man's world, it was very troublesome for her to make a distinction - and she or he's completed it in her personal very distinctive, distinct manner.
It has allowed her to continue with the legacy of the royal family while making a difference in the ways of public service.