Throughout history the royal family have set an example of how one must behave in public.
So onlookers were left surprised and amused when Prince William let his guard down at the 2017 Royal Variety Performance.
Every year, acts of every talent come together to put on a magnificent show at the London Palladium Theatre for the royal family.
This year Prince William and his wife, Kate, the Duchess of Cambridge, attended and it seems like they were having a positively wonderful time.
Seated in their private balcony above the stage, the royal couple watched and enjoyed as performers from all over the world entertained them.