The cookery writer and broadcaster has published more than 50 books during a career spanning more than five decades. She will be honoured during a Windsor Castle investiture ceremony with the Prince of Wales today.
Dame Mary has become a popular figure in recent years after being a judge on The Great British Bake Off and presenting her own programmes.
Kate and Prince William appeared alongside her in BBC show A Berry Royal Christmas in 2019.
During the festive special, the Duchess of Cambridge revealed that “Mary” was one of Prince Louis’ first words because he has been exposed to her cookbooks.
Kate said: “One of Louis’ first words was ‘Mary’, because right at his height are all my cooking books in the kitchen bookshelf.
“And children are really fascinated by faces, and your faces are all over your cooking books and he would say ‘That’s Mary Berry’ … so he would definitely recognise you if he saw you today.”
During the one-off programme, William and Kate went on a number of royal visits with the former Great British Bake Off star.
The TV cook said: “They don’t just arrive and shake a few hands make a few smiles and a speech, they want to get involved, and they want to see what they can do.
“And it isn’t just one visit, they come back again and ask for the results and they remember who they spoke to last time. I think that’s remarkable.”
The ceremonies resumed in June…