Catherine, Princess of Wales, is presiding over her yearly festive musical service at Westminster Abbey, with a congregation comprising royals, celebrities and local heroes who have made a difference in their neighbourhoods.
The sizable congregation will hear a selection of festive songs, musical performances, and spoken word pieces from performers including Chiwetel Ejiofor and Kate Winslet.
The focus of the service, held in the atmospheric historic church on the afternoon, is compassion and demonstrating care for others.
Among the guests will be Jonathan and Anna Cordiner, whose young girl was lost to a brain cancer, and who founded an organisation, Kayleigh's Wee Stars, to help households where there is a child with a terminal illness.
"Your efforts, love, and understanding, often quietly and unspoken, and without any hope for reward or acknowledgement, make an extraordinary difference to the circumstances of individuals," wrote Catherine in a message before the festive gathering.
The royal has been undertaking her own steady comeback to official duties after her cancer diagnosis and chemotherapy, last month delivering her major oration since 2023, in which she talked about recognising the "selfless, commonly overlooked efforts of carers".
Attendees entering the Abbey will enjoy performances from young musicians supported by the Future Talent organisation, set up with the help of the Duchess of Kent to broaden opportunities for musical tuition.
Carys Wood, aged 18, who performs on the trumpet and is from southwest Wales, has been assisted by the organisation, with awards contributing to musical instruments, lessons and travel costs - and she said it was "amazing" to be taking part in the concert.
"Pursuing music is often costly," Carys said. She is now a student at the renowned conservatoire, and added that "each individual ought to be given the possibility" to hone their artistic talents.
Her younger sibling Eliza, aged 11, who performs on the brass instrument, will be present at the Abbey. "It's unbelievable that I get to perform here in front of so many notable figures," she said.
Attending the service will be representatives of different generations.
That will include nine-year-old Saphia Turner, winner of a youth community award, who sells artwork and carries out sponsored challenges to collect donations for local food charities.
The Abbey has been decorated with handcrafted festive wreaths, with well-known chef Mary Berry and flower expert Simon Lycett assisting in their creation.
Taking to the stage will be recording artist Katie Melua, choristers from Westminster Abbey and a Cornish sea shanty group, Fisherman's Friends, who said the opportunity to perform was "the icing on the cake for us."
The Together at Christmas carol concert will be aired by television on December 24th.
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