The Duchess of Cambridge's former school has released several photographs of her while she was a pupil there.
Kate attended St Andrew's School in Pangbourne, Berkshire from 1986 until 1995.
The Duchess of Cambridge showed off her hockey skills when she joined a group of year eight 12-year-olds for a training session on a visit to her old school.
The Duchess of Cambridge formally opened a new Astroturf during her visit to the school, where she told students she spent some of her "happiest years".
In a speech she said:
"It is such a treat to be back here at St Andrew’s. I absolutely loved my time here; they were some of my happiest years, which makes it so incredibly special to be here today.
"In fact, I enjoyed it so much that when I had to leave, I told my mother that I was going to come back to be a teacher. While that didn’t quite happen, I was thrilled to have been asked back today on St Andrew's Day.
"It was while I was here at school that I realised my love of sport. Sport has been a huge part of my life, and I feel incredibly grateful for the opportunities I had to get outside and play in such wonderful open spaces - though sadly there was nothing quite as glamorous as this in my time."
The Duchess of Cambridge returned to her old prep school, St Andrew's School in Berkshire, to meet students and teachers.
The school traditionally observes St Andrews Day and Kate, who studied there from 1986 to 1995, wore a tartan coat which was in keeping with the occasion.