The King and Queen put on a united front as they arrived at Crathie Kirk near Balmoral on Sunday morning to honour the second anniversary of Queen Elizabeth II's death.
King Charles, 75, was seen in the back seat of a Bentley with his wife Queen Camilla, 77, sitting beside him.
The royals were driven to the church on Royal Deeside for an intimate Sunday morning service, which took place at 11.25 am.
Despite the sad occasion, the King appeared in high spirits as he and his wife shared a smile in the back of the car.
The Queen cut a regal figure wearing a green jacket with red and green tartan lapels and a green hat decorated with a feather. She smiled at awaiting photographers and camera crews as she held her handbag on her lap.
The King, who had a pink flower pinned to the lapels of his grey jacket, was seen adjusting his cuffs as he prepared for the poignant service.
Today, there will be a special episode of Songs of Praise aired on BBC One at 2.15pm from Crathie Kirk, to mark the King's Accession and the second anniversary of the late Queen’s passing. The episode will include a new hymn commissioned by the King.
REMEBERING QUEEN ELIZABETH II
King Charles' private summer at Balmoral
In keeping with his late mother's tradition, King Charles has spent the last of the summer at Balmoral in the Scottish Highlands - a place where Her Late Majesty was known to be "her happiest".
Queen Elizabeth II spent her final moments at her royal residence and was said to have "died peacefully at Balmoral," in the afternoon of this day two years ago.
It is certainly very poignant that Her Majesty spent her final days at Balmoral, as the 50,000-acre estate was well known to have been Her Majesty's favourite place on earth, and it was previously described as a "paradise in the Highlands" by the monarch herself.
In the ITV documentary, Our Queen at Ninety, Princess Eugenie said that her "Granny" is most happy in the Highlands, revealing how the royal clan like to spend their time together there.
The youngest daughter of Prince Andrew said: "Walks, picnics, dogs – a lot of dogs, there's always dogs – and people coming in and out all the time. It's a lovely base for Granny and Grandpa, for us to come and see them up there; where you just have room to breathe and run."