A "wonderful and proud day". (Picture: Princess Eugenie).
A photograph of the Duke of York inside Buckingham Palace on the same day he took part in Trooping the Colour as Colonel of the Grenadier Guards for the first time has been shared on social media by his daughter.
The picture of Prince Andrew was posted by Princess Eugenie on Instagram, who said it was "wonderful and proud day".
The Duke's former wife, Sarah, the Duchess of York posted her support on her Instagram page, writing: "Very proud of @hrhthedukeofyork Colonel of the Grenadier Guards."
Prince Andrew stood alongside Her Majesty the Queen and four generations of the royal family on the Buckingham Palace balcony to watch a flypast featuring Red Arrows, Typhoon jets and a Lancaster bomber during Trooping the Colour.
In watching the flypast next to his mother, he was taking the place of his father the Duke of Edinburgh who retired from public duties last year.
The Duke of York officially became the Grenadier Guards' Colonel-in-Chief at a reception at Windsor Castle in March, following the Queen's formal approval being given in December 2017.
Prince Andrew is also patron of Services Sound and Vision Corporation (SSVC) in Buckinghamshire - home to Forces TV and the British Forces Broadcasting Service (BFBS).
More: War Horse Statue Unveiled In Ascot