The two-day long event encompasses some of the Royal Family’s favourite horsing activities , including dressage, show jumping and different cross-country phases.
Zara was also pictured on the opening day of the event on horseback, having won a silver medal at the 2012 London Olymics for equestrian eventing.
Princess Anne’s daughter previously told People Magazine about how Savannah and Isla had caught the riding bug, saying “both my nieces ride, and they’re really into it at the moment”.
Mia and Savannah appear to have a close bond, as last year they danced along to ABBA at the Platinum Jubilee Pageant in June 2022.
Neither of the girls’s parents are working royals and they also do not have royal titles, yet as family members they are invited to official events such as the Platinum Jubilee and the Coronation.
All of the girls could also been enjoying the music at the Coronation Concert earlier this year, as Take That, Katy Perry and Lionel Richie entertained the crowds.
One person who was not present at the concert was Prince Harry, who flew straight back to Los Angeles as soon as the Coronation ceremony wrapped on May 6.
The Festival on Friday coincidentally fell on the same day as Meghan Markle’s 42nd birthday, with the couple enjoying a night out for dinner at celebrity favourite Italian restaurant Tre Lune in Montecito.
However according to a body language expert there appeared to be some signs of tension between Harry and Meghan during their outing.
