Prince George celebrated his first birthday with a party attended by the Queen and some of his godparents.
The Duke and Duchess of Cambridge held the event at their refurbished Kensington Palace apartment and invited close family and friends.
Earlier the Queen had spent some quality time privately with her great grandson when William and Kate took the toddler to Buckingham Palace.
The royal party are likely to have enjoyed tea in the Queen's private apartments but they probably kept a watchful eye on the future king.
The Duke revealed last week during a visit to Coventry that his son is charging around and can open doors.
Among the first to arrive for the birthday celebration was the toddler's godparent Jamie Lowther-Pinkerton, William's former principal private secretary until leaving the part-time role earlier this month.
George's grandparents Carole and Michael Middleton were also spotted passing through the palace's gates as was their son James and another godparent Emilia Jardine-Paterson.
William's cousin and another godparent Zara Phillips also attended along with her husband former England rugby player Mike Tindall.
The Queen arrived for the party in a state car and was greeted by crowds who were waiting outside the gates of Kensington Palace.
George was born on July 22 last year at the private maternity wing of St Mary's hospital in London and has grown up into an inquisitive, confident and lively toddler.
Two touching photographs of William, Kate and George were released to officially mark George's anniversary, and the Cambridges paid their own tribute to the public support they have received over the past 12 months.
The family were photographed for the official pictures during a visit to the Sensational Butterflies outdoor exhibition at London's Natural History Museum, of which Kate is a patron.
In a short message the Duke and Duchess said: "We would like to take this opportunity on George's first birthday to thank everyone over the last year, wherever we have met them, both at home and overseas, for their warm and generous good wishes to George and our family."
Well-wishers especially took the royal couple and their son to heart when the Cambridges travelled with George to New Zealand and Australia in April.
Meanwhile, the Prince of Wales was presented with a special gift for his grandson's first birthday on a visit to a Scottish estate.
Charles was gifted a giant hand-made red squirrel toy for Prince George on a visit to Glendelvine Estate near Dunkeld in Perthshire.
He was also given handmade cards and posters made by Perthshire children for the youngest royal.