The Princess of Wales, who was photographed with her three children, also shared a personal message.
The newly-crowned monarch sat for the regalia-riddled portrait on the day of his coronation.
Sunday marked the first time the 4-year-old prince accompanied his family to Easter church services.
He's going to be lording this over his siblings for years to come.
The Prince and Princess of Wales gave followers a glimpse of their eldest son's artistic streak on Christmas Day.
Prince William relayed the story to the singer at a Buckingham Palace party.
Prince William and Kate Middleton's two eldest children participated in their great-grandmother's funeral on Monday.
The Duke and Duchess of Cambridge are making significant life changes this year.
The portrait of Kate Middleton and Prince William's eldest was taken by the Duchess of Cambridge herself.
The future heir to the throne watched Sunday's match from the Royal Box with his parents, Prince William and Kate Middleton.
