Britain's Zara Phillips changed her outfit in the middle of a field at the Dauntsey Park Horse Trials over the weekend.

Zara Phillips

Zara Phillips

The 34-year-old royal - the granddaughter of Britain's Queen Elizabeth - was spotted swapping her show-jumping ensemble for jodhpurs and a navy bomber jacket for the cross country section at the event in Wiltshire, England.

The blonde stunner hopped off her horse, Castle Black II, dug around in her plastic bag for her new attire and tugged at her clothes, while chatting away to event organisers.

Pulling her helmet off her head, Zara gave a big grin to onlookers as she pushed her tresses back into the hair net, according to photographs obtained by the MailOnline.

The mother-of-one tucked her black T-shirt into her trousers, pulled on her gloves and hopped on her horse for the event, before she made a peace sign towards photographers.

Meanwhile, Zara - the daughter of Princess Anne - is hoping to compete in the 2016 Olympics in Rio de Janeiro, Brazil.

However, her husband Mike Tindall, with whom she has 22-month-old daughter Mia, is determined to wrap her and her horse up in cotton wool in order to avoid injury.