One of the newly-released photographs from the carol concert, which will be available to watch on ITVX on Christmas Eve, shows Prince Louis and Princess Charlotte focusing intently.

The two siblings, who are the youngest of Prince William and Princess Catherine’s three children, behaved impeccably at the event, which they have attended multiple times now.

Prince Louis and Princess Charlotte both seemed focused on whatever they were looking at, and seemed to enjoy the evening out.

(Image: Kensington Palace / PA)

Another newly-released photograph showed the Royal Family seeming to enjoy watching a dance performance at the carol service, with Princess Charlotte, Princess Catherine and Zara Tindall in particular looking happy as they watched.

In the photograph, other members of the Royal Family can be seen clearly, including Sophie Winkleman and the Duchess of Gloucester.

(Image: Andrew Parsons / Kensington Palace)