The Queen spoke about her fondness for Royal Ascot in her foreword for the official programme: "My family and I greatly look forward to Royal Ascot". It was apparently Queen Anne who first decided that the grounds on which the course is now set were flawless for a horse race, around 1711.
The annual five-day horse-racing event requires quite the strict dress code, including asking all ladies to cover their shoulders and wear hats and name tags. The ultra-modern frock featured an edgy asymmetrical hemline - a stark contrast to the sea of pastel-coloured dresses on show.
The Duchess of Sussex wore a stunning off-white Givenchy dress with a black-and-white hat to match for a flawless monochromatic look.
Meghan, 36, sported a long-sleeve collared white Givenchy dress with a black belt, making this the third time she's worn the designer in the past month, including her iconic wedding gown.
Harry and Meghan were next, with the Earl and Countess of Wessex, and waved as they travelled past the packed stands on their way to the royal box.
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Racegoers often wear big and bold hats on the first day of the races at Royal Ascot, and this year was no exception.
Prince Charles, Prince of Wales, Camilla, Duchess of Cornwall and Meghan, Duchess of Sussex attend The Prince of Wales' 70th Birthday Patronage Celebration held at Buckingham Palace on May 22, 2018 in London, England. Royal Ascot is a tradition going back centuries - and has its roots with the royal family.
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend day 2 of Royal Ascot at Ascot Racecourse on June 15, 2016 in Ascot, England.
For their first official royal engagement overseas as a married couple, the Duke and Duchess of Sussex are heading to Dublin. "The visit is at the request of Her Majesty's Government", the tweet read.
The couple weren't the only royals on hand.