And with her bright blue eyes and carefully coiffed blonde hair, the talented rider bore a striking resemblance to her mother, Sophie the Countess of Wessex.
The young royal smiled as her mother and father Prince Edward, the Queen and Prince Philip's youngest son, took photos of her moment in the spotlight.
The 95-year-old Duke is a keen carriage driver, having taken it up competitively when he retired from polo in the 1970s.
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Sitting in the carriage with impeccable posture, Lady Louise Windsor looked every inch the young royal as she took the reins at the Windsor Horse Show today.
The 13-year-old remained perfectly composed as she led the carriages of the Champagne Laurent-Perrier Meet of the British Driving Society into the showground.