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Prince George and Princess Charlotte danced the night away at the Coronation Concert at Windsor Castle.
In the royal box with King Charles and Queen Camilla, the youngsters bopped to the sound of Lionel Richie’s hit All Night Long and Take That’s anthems.
In a big royal sing-along, Princess Charlotte and Prince George waved their flags enthusiastically and swayed in time to the music.
The princess also sang the words to Katy Perry’s Roar and Firework, as the US singer took to the stage in a shiny gold metallic ball gown.
Ahead of Take That’s finale, Kermit the Frog joined the Windsors in the royal box.
The Muppet, dressed in a smart suit and tie, bounced on the spot and waved his flag in front of a delighted Duke of Edinburgh.
It was a special late night out for the Prince and Princess of Wales’s two eldest children, who are just nine and eight, after a busy day on Saturday at their grandfather’s coronation.
Prince George, Princess Charlotte and Prince Louis attend the coronation - in pictures
Like the rest of the 20,000-strong crowd, they wore flashing LED wristbands.
Prince George and Prince William smiled and laughed together as they enjoyed the show.
Among the star royal dancers was the Duchess of Edinburgh, who beamed as she danced to Richie’s set.
When Prince William took to the stage to deliver a touching tribute to his “Pa” the King, Princess Charlotte turned to Prince George to get his attention, pointing at the stage with her flag.
The princess was wearing a white dress with frilled Peter Pan collar and bow, but later put on a white coat over the top, while Prince George was in a suit and tie just like Prince William's.
Best moments of the royal children at the coronation
Coronation Concert - in pictures
Prince Charlotte was seen singing “bring me a higher love” to Steve Winwood’s performance of Higher Love.
Five-year-old Prince Louis was not at the concert, with the late-night show starting past his bedtime.
In the second row, Peter Phillips’s daughters Savannah and Isla waved union flags, while also in the front row were the Edinburghs’ children Lady Louise Windsor and the Earl of Wessex.
Princess Charlotte curtseyed to the king and queen as they arrived while Prince George gave them a bow.
At one point, Prince Charlotte bent backwards as Prince William playfully waved a flag near her face.
Princess Catherine wore a vivid red suit, while Queen Camilla was in a royal blue Anna Valentine jumpsuit.
