Despite her young age, Charlotte is already settling into a lifetime of royal duties.
The toddler began classes at Willcocks Nursery School in January 2018, and the occasion was marked with two official pictures from her mother, which have been released on Kensington Palace social media accounts.
The 2-year-old is shown on the steps of the palace in one photo and standing holding onto a rail in another.
The Queen was homeschooled at Buckingham Palace by private tutors and teachers, so she doesn't have first day portraits like her children, grandchildren, or great-grandchildren do.
The Cambridges will then be prompted to see if their daughter, who can bring a favourite photo or toy from home, "is happy to be left".
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Charlotte's older brother Prince George went to preschool at Westacre Montessori School in Norfolk and is now in kindergarten in London.
The fourth-in-line to the throne will be a full-time pupil at the school, which charges fees of just over $5000 AU a term.
On its website the school, rated as "outstanding" by government inspectors, describes itself as traditional, saying it "strives to maintain its ethos for high standards, excellence and good manners". Though Charlotte looks a little more excited, the resemblance is evident. Visitors include emergency services workers, and Prince William will be able to swap stories with other dads at "fathers' breakfasts".
"We are delighted that The Duke and Duchess of Cambridge have chosen the Willcocks Nursery School for Princess Charlotte", a spokesperson for the school said in December.