Click through the gallery to see the most stylish looks donned by the royals at 2018's Trooping the Colour.
As part of the day's pomp, almost 1,000 soldiers march to Horse Guards Parade and the Royal Air Force performs a flyover (which the royals famously watch each year from the balcony at Buckingham Palace).
As People reports, Duchess Meghan joined Harry, his brother William and wife Kate Middleton along with their children, Prince George and Princess Charlotte (little Prince Louis stayed home), in addition to Prince Philip, Prince Charles and Camilla, Duchess of Cornwall.
Meghan wore a Carolina Herrera dress and a hat by Philip Treacy.
From the vantage point of the Duke of Wellington's old office, which overlooks Horse Guards Parade, Camilla, Harry, Meghan and Kate and the other members of the Royal Family watched the finale of the event.
"She also wore some new pieces from Birks-obviously now looking to be Meghan's jeweler of choice-which were a nice nod to her Canadian "roots" (whilst not being Canadian) while also still including more diamonds as befitting her new status".
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The Duke and Duchess of Sussex, who married three weeks ago, made the short trip from Buckingham Palace to Horse Guards Parade in a horse-drawn carriage as royal fans lining the Mall cheered and waved.
While Meghan has blossomed into the epitome of royal sophistication already, Prince Harry in his black uniform looked like a knight in shining armour.
The Duchess of Sussex broke protocol with her off-the-shoulder outfit.
Her husband, the Duke of Edinburgh, attended the event with her previous year, but was absent today. Princess Charlotte made her first appearance at 13 months and George shortly before his 2nd birthday.
Meghan also had her hair styled in a bouncy blowout. Of course Queen Elizabeth II was front and center.
"I'm quite proud and I know that a lot of other people are proud of me as well", he said. They are expected to travel to Australia, New Zealand, Fiji and Tonga.