Kate photographed the two-year-old, who is fourth in line to the throne, at Kensington Palace before traveling to nearby Willcocks Nursery School.
Charlotte is pictured sitting down on some outside steps in the grounds of the famous palace and another standing as she holds onto a rail.
The young princess is wearing a scarf, coat and appears to have a rucksack on her back.
The Duke and Duchess of Cambridge are very pleased to share two photographs of Princess Charlotte at Kensington Palace this morning.
The princess will be a full-time pupil at the nursery, which charges fees of just over £3,000 a term for pupils attending its Monday to Friday morning school, and employs lots of play as children learn.