Prince Louis turns eight

The Prince and Princess of Wales shared the annual birthday photo on their social media accounts, thanking the public for their well wishes.

In addition to the portrait, a short video was released showing Louis playing on a beach and diving into the sea.

Royal observers have noted the young prince's striking resemblance to his father, Prince William, at the same age.

The celebration comes as the family prepares for King Charles' upcoming state visit to the United States.