The Duke and Duchess of Cambridge were photographed speaking with invited guests ahead of the concert.
They included “unsung heroes”, people connected with the Cambridges’ various charities, members of the Armed Forces and those in the community who “may be more vulnerable or isolated within our society”.
Other members of the royal family joining the Cambridges included Sophie, Countess of Wessex; Princess Eugenie; Princess Beatrice and husband Edoardo Mapelli-Mozzi; and Zara and Mike Tindall.
Members of the Middleton family were also in attendance, including Michael and Carole Middleton, Kate’s sister, Pippa, and brother, James, who was joined by his new bride, Alizee Thevenet.
Royal fans will need to wait until Christmas Eve for the concert to be broadcast on British TV channel ITV.