Prince George and Princess Charlotte were seen singing alongside their parents William and Kate during the state funeral of their great-grandmother Queen Elizabeth II.
George, nine, and Charlotte, seven, walked side-by-side into Westminster Abbey behind their parents, followed by their aunt and uncle, the Duke and Duchess of Sussex.
The second and third in line to the throne could be seen in television coverage, standing on either side of the Princess of Wales and taking part in the hymns.
George and Charlotte have been given new titles - Prince George of Wales and Princess Charlotte of Wales - after Prince William and Kate Middleton became known as the Prince and Princess of Wales.
Meanwhile, their younger brother Prince Louis, four, did not attend the ceremony.
The night before the funeral, King Charles III hosted a reception for Commonwealth dignitaries - during which, the Princess of Wales spoke to Australia's Governor-General David Hurley about how her youngest was coping with it all.
While Prince George is 'sort of now realising how important his great-grandmother was and what is going on', Mr Hurley reported, adding that Kate feels Louis is still at a bit of a loss.
"The younger one is now asking questions like, 'do you think we can still play these games when we go to Balmoral?' and things like that, because she's not going to be there," he said.
The state funeral service, which was screened to an estimated four billion people, was conducted by The Very Reverend David Hoyle, Dean of Westminster.
Before the ceremony took place, a bell was tolled every minute for 96 minutes, to mark every year of the Queen's life.
Towards the end of the service, a silence was observed "in all UK government buildings" as well as by various private individuals, businesses and organisations.
The monumental service paid tribute to the late monarch's reign and her lifetime of service as head of state, nation and Commonwealth.
The Queen's coffin will now be transported to Windsor Castle, where she will be privately interred in the King George VI Memorial Chapel alongside her late husband, Prince Philip, the Duke of Edinburgh, who will be moved from the Royal Vault in St George's chapel.
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