He made a surprise appearance with the King to speak to those waiting to enter Westminster Hall.
King Charles and Prince William have made a surprise appearance to meet some of those queuing to see the Queen lying in state.
They thanked those who had been waiting through the night to pay their respects, with the King saying: “I hope you didn’t get too frozen.”
The Prince of Wales said how much it meant for his family that so many thousands were there.
He told the crowds at Lambeth Bridge: “You’re over halfway.”
There were cheers of God Save the King as they walked up and down the queue.
William told some people personally he was sorry they had to wait so long.
The queue time is now around 14 hours, with the line stretching five miles along the Thames to Southwark Park.
On Saturday evening, the Prince of Wales and his cousins will stand guard around the Queen’s coffin, a day after their parents held their own vigil at the Palace of Westminster.
Prince Harry has been given permission by his father to wear military uniform.
The Duke of Sussex will stand at the foot of the coffin, with Prince William at the head. They will be joined by their cousins Princesses Beatrice and Eugenie, Peter Phillips, Zara Tindall, Lady Louise Windsor and James, Viscount Severn.
Saturday is the third full day the Queen’s coffin will lie in state in Westminster Hall, where she will remain until the morning of the funeral, on Monday.
