The Duchess of Cambridge and husband Prince William were among the guests at day two of the iconic horse racing competition, joining The Queen, Prince Philip, Prince Charles, Camilla, Duchess of Cornwall and Sophie, Countess of Wessex.
Kate, 34, looked beautiful in a cream lace dress and matching heels, teamed with a cream hat and small box clutch.
She joined Prince William in a horse-drawn carriage for the royal procession, which took place under drizzles, prompting The Queen to shelter under an umbrella.
Kate and William, who were without children George and Charlotte, arrived at Ascot from Northern Ireland, where they attended the annual garden party at Hillsborough. While there, Kate planted a tree in the grounds of the historic castle, watched by the 2,500 guests at the party.
Prior to that, the couple visited the US Embassy in London to sign a condolences book for the victims of the Orlando nightclub shooting.
Watch Kate and William leaving The Queen's 90th birthday celebrations at St. Paul's Cathedral below: