William reveals Charlotte is 'very tired' after 'making sure Louis behaved' at Coronation

ok.co.uk:

Prince William and Kate Middleton, the Prince and Princess of Wales surprised Coronation Concert-goers with a walkabout at Windsor's Long Walk, where William briefly opened up about his family.

During the walkabout, William was asked by one young royal fan where Princess Charlotte was, to which he replied: "She’s very tired after yesterday.

She’s having a quiet day at home. It was making sure her little brother behaved herself.The Prince then spoke to the Rock Choir who had just performed on a stage that had been assembled on the walk, joking that Prince Louis has been listening to a lot of Led Zeppelin recently.

The Prince and Princess of Wales then spoke to members of the Berkshire Theatre School, who had performed songs from Matilda the Musical earlier in the day.