Senior members of the Royal Family attend events all year round - and some of them are regular dates in their agendas.
One of these events is Garter Day, which this year is taking place on Monday, June 19, at Windsor Castle. It is the first time the event is held since the death of Queen Elizabeth II.
While attending the event in 2019, Camilla, then Duchess of Cornwall, was filmed giving Catherine, then Duchess of Cambridge, a subtle reminder while she chatted away with another guest.
Footage shows that Kate almost got lost in conversation with Queen Maxima of the Netherlands that they almost missed an important part of the procession.
Luckily Camilla was on hand to tap Maxima on the arm and remind the ladies to face forwards while the parade passed - and Sophie Wessex was also seen quickly taking her place in the lineup next to Letizia.
The Order of the Garter was founded by Edward III in 1348 recognising contributions to public service.
Nearly 700 years later, the Order is the oldest and most senior Order of Chivalry in Britain. The Knights, who are now both male and female, were once just aristocracy, but nowadays they are chosen from a variety of backgrounds, in recognition for their public service.
Today, the Order includes The King, who is Sovereign of the Garter, several senior Members of the Royal Family, and twenty-four knights chosen in recognition of their work.
Knights of the Garter are chosen personally by the Sovereign to honour those who have held public office, who have contributed in a particular way to national life or who have served the Sovereign personally.
These have included Marshal of the RAF, Lord Stirrup, and former Prime Ministers Sir John Major and Sir Winston Churchill.
The patron saint of the Order is St George and if there are vacancies in the Order, appointments are announced on St George's Day, which falls on April 23.
