As the UK's head of state, King Charles has number of parliamentary and constitutional duties.
The photo shows William and Catherine lying in grass with their children, Prince George, Princess Charlotte and Prince Louis.
How the line of succession passes through generations of the Royal Family
A post shared on Kensington Palace's social media reads: "Wishing everyone a very Happy Christmas."
A new photograph of Prince George to mark his 12th birthday has been issued by Kensington Palace.
Princess Kate and Paul Mescal were among the famous faces in the royal box for the final day of the tennis championship.
The Prince and Princess of Wales arrived at Wimbledon with two of their children on Sunday.
The Prince and Princess of Wales have shared new photos of Prince William with George, Charlotte and Louis.
Kensington Palace has posted the image, taken by his mother, Catherine, Princess of Wales.
