The annual display of British military might serves as a seasonally tweaked birthday celebration for the sitting monarch.

Members of Britain's royal family gathered at London's Buckingham Palace on Saturday for Trooping the Colour, including Prince William and Kate, the Princess of Wales, and their three children, Princes George and Louis and Princess Charlotte.

It was a Trooping the Colour to remember over the weekend as King Charles marked his official birthday celebration on Saturday—a long-standing tradition where the British monarch publicly acknowledges their birthday in June versus the actual day in order to take advantage of better weather.