King Charles III's Coronation takes place today, with over 2,000 people expected in the congregation at Westminster Abbey.
Prince William will play a key part in the ceremony as he swears allegiance to his father, but Prince Harry will have no formal role in the service and will instead just be part of the congregation.
Tens of millions are expected to watch the royal spectacle on television across the world and now the order of service has been released, so people can follow along at home.
