Equerry Lieutenant Colonel Jonathan Thompson stood by the monarch's side, ensuring a secure entrance for the king and other senior royals into the church.
Later today, the Prince and Princess of Wales, along with their children and additional senior royals, will join King Charles and Queen Camilla on the Norfolk estate for the festive celebrations. However, Prince Harry and Meghan Markle have opted to celebrate December 25th stateside at their residence in Los Angeles.
Contrary to reports, there is no truth to the speculation that King Charles and Queen Camilla are hosting a larger-than-expected family gathering, with Camilla's family joining them at Sandringham. The royal celebrations unfold with the anticipated reunion of family members at the picturesque Norfolk estate.