To mark the occasion (and coincidentally, her one-month wedding anniversary), the 36-year-old royal gave us pure "My Fair Lady" vibes wearing gold and diamond stud earrings by Birks, an elegant white-and-black hat by Philip Treacy and an all-white ensemble by Givenchy.

WireImageThe Duke and Duchess of Sussex attend Royal Ascot Day 1 at Ascot Racecourse on June 19.

The Duchess of Sussex arrived to the racehorse track by carriage, accompanied by her husband, the Duke of Sussex, as well as Prince Edward (the youngest son of the Queen and Prince Philip) and his wife Sophie, Countess of Wessex.

AFP/Getty ImagesMeghan Markle arrives at the Royal Ascot with Prince Harry and Sophie, Countess of Wessex and Prince Edward (not pictured).

Since its creation in 1768, it's become tradition for a British monarch to attend every Royal Ascot, CNBC reports. On each of the five days of the sporting event, Her Majesty arrives by carriage with members of her family at precisely 2 p.m.

Prince Charles, the Duchess of Cornwall, and Prince Andrew's daughters, Princess Beatrice and Princess Eugenie, rode in a separate carriage.

Getty Images for Ascot RacecoursePrince Charles and Duchess of Cornwall arrive with Princess Eugenie and Princess Beatrice (who is not pictured).

The Duke and Duchess of Cambridge were noticeably absent from the Queen's favourite horse-racing event.

In the past, Catherine has only attended the Royal Ascot on two occasions and did not make her official debut at the event until five years after tying the knot with Prince William in 2011, The Mirror reports.

Currently, the Duchess of Cambridge is on maternity leave, which could explain her absence. Catherine and Prince William welcomed their third child, Prince Louis, in April. While they did not attend the first day of the Royal Ascot, they could still attend one of the other days of the sporting event.