Prince George, 12, Princess Charlotte , ten, and seven-year-old Prince Louis joined the King and Queen at the traditional Sunday service at St George's Chapel in Windsor.
The Prince and Princess of Wales's youngest child, Louis and Lena, the youngest daughter of Zara and Mike Tindall, are both seven and are already believed to be best friends.
The image, showed Kate and William, both 43, alongside their children, Prince George, 12, Princess Charlotte, ten, and Prince Louis, seven, smiling in a grassy Norfolk location back in April.
Young royals including Princes George and Louis and Princess Charlotte have been pictured arriving for a Buckingham Palace Christmas lunch hosted by the King.
The Prince of Wales revealed that he and his wife Kate had imposed a 'strict' ban on mobile phones for Prince George, 12, Princess Charlotte, 10, and Prince Louis, seven.
The Princess of Wales, 43, revealed that her youngest child, Prince Louis, seven, has a new favourite hobby, sharing the information with US First Lady Melania Trump.