Following the parade, which involves around 1,400 soldiers, the King's Troop Royal Horse Artillery will fire a 41-gun salute in Green Park.
The Duchess of Sussex took a small break from her maternity leave to pop out for the annual event.
And on Saturday, a grand parade known as the Trooping of the Colour marked the official birthday of the reigning British monarch. As the Royal Family disappeared back into the Palace, the Prince of Wales was seen holding Louis' hand as the Duke of Cambridge carried his youngest child inside. She and husband William, who was decked out in a red ceremonial uniform, alternated holding baby Louis while Princess Charlotte and Prince George stood in front of them on the balcony.
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The Duchess donned a gorgeous navy design from Givenchy with a hat, peacock blue clutch and emerald-cut earrings. Did Harry give it to her?
At the end, the extended royal family gather on the palace balcony to wave at the crowds and watch a fly-past of military jets.
As with previous year, Meghan standing at the back may be down to a few different factors, reports he Mirror.
Trooping the Colour orginated from traditional preparations for battle and has commemorated the birthday of the sovereign for more than 250 years.