Lady Louise, Duchess Sophie's daughter and the 16th in line to the throne, arrived to the royal home with her fiancé to spend time with her family.
The 21-year-old was accompanied by her university boyfriend Felix da Silva-Clamp and her mother, the Duchess of Edinburgh, when she competed in the famous Horse Driving Trials at Sandringham estate on Friday.
King Charles III's niece seemed serene and confident as she competed in the carriage driving competition, which her late grandpa founded.
Felix da Silva-Clamp, whom Louise met while studying at St Andrews University, relished the occasions when his girlfriend displayed her equestrian abilities.
Duchess Sophie was also present to encourage her daughter, interacting cordially with the other guests at the Norfolk estate.
Lady Louise has been actively engaged in carriage driving since she was a teenager, continuing her grandfather's sports history within the royal family.
Prince Philip launched the competition in 1982 to bring his favourite sport to one of his chosen royal estates. The late Duke of Edinburgh took up carriage in his forties after retiring from polo, and despite occasional tumbles during contests, he remained enthusiastic about the sport until his elder years.