Princess Charlotte, daughter of Prince William, Duke of Cambridge, and his wife Kate Middleton, Duchess of Cambridge, arrived for her first day of school accompanied by her parents and her brother Prince George at Thomas's Battersea in London, September 5, 2019. /VCG Photo

The four-year-old princess, dressed in the school's uniform, was greeted by the school's head teacher Helen Haslem with a handshake. /VCG Photo

The school is strict about children's appearance as it requires that the hair longer than the shoulder length should be tied back. Charlotte has done a good job with a neat ponytail. /VCG Photo

Charlotte is fourth-in-line to the British throne, after - in ascending order - six-year-old George, her father William and her grandfather Prince Charles. /VCG Photo