The Trooping the Colour is a ceremony performed by regiments of the British and Commonwealth armies to mark the official birthday of the British sovereign. Since her 2011 Trooping the Colour debut, Kate Middleton has never worn short sleeves, and neither did Princess Diana.
The couple later joined other members of the royal family on the palace's front balcony to watch the royal fly-past.
So she's unlikely to have been surprised yesterday when the Queen's great-grandchildren stole the show as they giggled and danced their way through Trooping the Colour.
Meghan fussed with her loose hair and seemed to be troubled by her Philip Treacy hat.
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Markle's got another big milestone coming up, when she will travel solo with Queen Elizabeth by train to Chester for royal business.
When the queen first arrives, she's greeted by a royal salute before she carries out an inspection of the troops, who are fully trained and operational soldiers wearing the ceremonial uniform of red tunics and bearskin hats. Her husband, Prince Philip, has retired from royal duties and did not attend. Such was the case during Meghan and Harry's return to Buckingham Palace, when she could be seen trying to keep her hair in some semblance of order.
Britain's Prince Harry and Meghan, Duchess of Sussex, take part in the Trooping the Colour parade in central London, Britain, June 9, 2018.
Her son Prince Louis, who was born on April 23, did not make a balcony appearance.
The Ministry of Defence said he was "receiving medical attention" but would not give further details.