The Princess of Wales, 41, appeared in the royal procession at the Berkshire racecourse next to Prince William, 41, Princess Beatrice, 34, and Edoardo Mapelli Mozzi, 39.
Princess Beatrice, 34, who has just become an auntie once more after her sister Eugenie gave birth for the second time, looked elegant as she arrived at the event earlier this afternoon.
Sophie, 58, was the image of summer style in a flowy white frock, adorned with colourful flower motifs, as she enjoyed the annual Berkshire event with her father Christopher Rhys Jones.