The picture shows the Prince of Wales and the Duchess of Cornwall in a garden at their Birkhall residence in Aberdeenshire.
Camilla holds her hands in a heart shape in the sweet photo as Charles beams.
The couple are sitting on a bench surrounded by beautiful flowers.
Camilla is casually dressed in blue jeans, a pink shirt and blazer, while Charles wears a cream suit.
The Christmas card image was taken by a member of their staff.
Royal fans reacted with delight to the picture on Clarence House’s Instagram.
One commented: “I love how happy they look together. Always smiling. Charles especially.”
Another wrote: “I love this couple so much.”
A third gushed: “Beautiful photo of a beautiful couple.”
Another said: “Beautiful photo. Happy Christmas HRH’s.”
A fifth commented: “Lovely photo lovely couple happy Christmas your HRH’s.”
One more added: “A fantastic couple. Merry Christmas!”
Charles and Camilla will spend Christmas Day at Highgrove, their Gloucestershire home.
They are expected to see the Queen and Prince Philip at Windsor Castle during the festive period.
The monarch is usually joined by other members of the Royal Family at Sandringham in Norfolk for Christmas.
But she will have a quiet December 25 this year with the Duke of Edinburgh at her Berkshire residence due to the coronavirus pandemic.
Earlier this month, a Buckingham Palace spokeswoman said: “Having considered all the appropriate advice, the Queen and the Duke of Edinburgh have decided that this year they will spend Christmas quietly in Windsor.”
It is not known what Prince William and Kate will do for Christmas.
The Duke and Duchess of Cambridge also released their Christmas card on Wednesday.
They are pictured sitting on a bail of hay with their children in the image.
Prince George, seven, Princess Charlotte, five, and two-year-old Prince Louis are pictured smiling as they sit with their parents.
Little Louis looks particularly excited in the adorable family snap.
The picture, taken at Anmer Hall, which has a large woodpile as its backdrop.