The Princess of Wales finished second best after taking on double Olympic champion Dame Kelly Holmes – at a game of bean-bag noughts and crosses.
Kate, who is known for her competitive streak, joined a team of pupils being supported by Dame Kelly’s trust at its base in Bath, with the former sports star on the other team.
The children from St Katherine’s School in Bristol are taking part in the On Track To Achieve programme, delivered by their athlete mentor and Paralympic gold medallist Liz Johnson.
Kate did her best but Dame Kelly’s team won twice.
After the first victory, the track and field star held her arms aloft and admitted she is “slightly competitive”.
The princess joked: “You would never have guessed.”
It pairs world class athletes with youngsters, who may lack confidence or have other issues, so the sportsmen or women can pass on their winning mindset and help the schoolchildren develop the skills and confidence they need to succeed in life.
The princess later sat down to chat to the pupils, all girls aged from 11-13, who spoke about their experiences at school, home life and the benefits of being mentored by a sports star.