Prince George, 4, arrived for his first day of school with his father Prince William on Sept. 7, 2017.
The two princes were met by Helen Haslem, the head of the lower school at Thomas's Battersea, an independent fee-paying school in south London costing $23,000 a year.
Illness prevented the young prince's mother from joining them. The Duchess of Cambridge, the former Kate Middleton, is suffering from hyperemesis gravidarum during her third pregnancy.
This undated photo was released by the Duke and Duchess of Cambridge of Prince George, who celebrated his fourth birthday on July 22, 2017. The picture was taken at Kensington Palace in London at the end of June.
Prince George and his sister commanded worldwide attention with their adorable antics as they departed from Hamburg, Germany, on July 21, 2017, the last day of an official visit to Poland and Germany.
Princess Charlotte stole the show from her older, sleepy brother July 19, 2017, as the family arrived at the Berlin Tegel Airport during an official visit to Poland and Germany.
Catherine, Duchess of Cambridge, and her children, Prince George and Princess Charlotte, attend the wedding of the mother's sister, Pippa Middelton, on May 21, 2017. George was a page boy, and the royal family drew significant attention during the event.
Young Prince George with his newborn sister, Princess Charlotte, in a June 2015 photo.
Prince George on a royal family trip to Australia.
Prince George at Christmas 2014.
Prince William and Catherine, the Duchess of Cambridge, gave the world its first glimpse of Prince George Alexander Louis when they left St. Mary's Hospital in London on Tuesday, July 23, 2013.
William joked George has "a good set of lungs" and his mother's good looks.
The prince even took his son into his arms and walked about with him while answering reporters' questions, showing he truly wants to be a hands-on father.
The young prince, third in line to the British throne, is known as His Royal Highness Prince George of Cambridge.