Lady Louise Mountbatten-Windsor joined her parents for a rare joint public outing on Saturday afternoon.
The Earl and Countess of Wessex and Lady Louise were joined at the Royal Windsor Horse Show by The Queen.
The show is an annual event held on the grounds of Windsor each year.
So far, Her Majesty has attended all three days of the show, with just one more day to go.
The Countess of Wessex joined the 95-year-old monarch on Thursday for the opening day, with Prince Edward accompanying her on Saturday.
Lady Louise is The Queen’s youngest granddaughter and will be competing at the Royal Windsor Horse Show.
Louise is an avid competitor in her late grandfather’s favourite sport, carriage driving. She notably inherited Prince Philip’s carriages and ponies after his death in April.
The 17-year-old royal has competed in the competition before. In 2019, she finished in third place at the event, with The Queen and the Duke of Edinburgh cheering her on from the crowd.
First held in 1943, the Royal Windsor Horse Show it is the only UK horse event that hosts international competitions in show jumping, dressage, carriage-driving, and endurance driving, and is the largest outdoor horse show.