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Trooping the Colour is expected to come shortly, as Buckingham Palace and the Royal Family prepare to celebrate the King's formal birthday.
There have been many memories linked with this magnificent event in the past, and the royals have had their share of uncomfortable moments.
In 2016, a light-hearted reprimand from the late Queen Elizabeth II captured the public's attention.
During that year's celebrations, Prince William received a sharp but kind admonition from his grandmother while standing on the Buckingham Palace balcony during the flypast.
Princess Charlotte, who was just over a year old at the time, was held by her mother, Kate, while Prince William looked after baby Prince George, who was three years old.
In an attempt to explain the flypast to his inquisitive son, William leaned down to chat with George, unwittingly obstructing the view of the throng below.
Noticing this, the Queen seemed dissatisfied that William was briefly veiled from public view.
She leaned closer him and allegedly murmured, "Stand up, William." Do not crouch. The Prince immediately got to his feet, appearing slightly embarrassed yet amused by his grandmother's swift rebuke.
