The Princess of Wales is hosting her yearly Yuletide celebration at the historic Abbey, with attendees featuring royals, celebrities and local heroes who have made a difference in their neighbourhoods.
The sizable congregation will listen to a blend of carols, music and readings from performers including Kate Winslet and Chiwetel Ejiofor.
The theme of the service, held in the glowing Westminster Abbey on Friday afternoon, is kindness and showing love to others.
In the audience are Anna and Jonathan Cordiner, whose young girl was lost to a brain cancer, and who established a foundation, Kayleigh's Wee Stars, to support families who have a terminally ill child.
"Your efforts, love, and understanding, often quietly and unspoken, and without any thought of thanks or praise, make an profound impact to the well-being of people," wrote Catherine in a note prior to the festive gathering.
The princess has been making her own measured re-emergence to official duties after her cancer diagnosis and chemotherapy, in November making her major oration since 2023, in which she discussed recognising the "selfless, commonly overlooked efforts of carers".
Those coming to the Abbey can listen to budding artists backed by the Future Talent organisation, co-founded by the former royal to broaden opportunities for instrumental training.
An 18-year-old named Carys Wood, who performs on the trumpet and is from southwest Wales, has been helped by the organisation, with grants helping towards musical instruments, lessons and travel costs - and she said it was "incredible" to be playing at the concert.
"Pursuing music is often costly," Carys said. She is now enrolled at the renowned conservatoire, and added that "all people deserve the chance" to cultivate their performance abilities.
Eliza, Carys's sister who is 11, who is a euphonium player, will be present at the Abbey. "It's unbelievable that I get to perform here in front of so many notable figures," she said.
Within the audience will be representatives of different generations.
That will feature young Saphia Turner, nine, recipient of a young hero award, who sells artwork and carries out sponsored challenges to collect donations for community pantries.
The Abbey has been adorned with handcrafted festive wreaths, with well-known chef Mary Berry and flower expert Simon Lycett contributing to their design.
Among the musical performers will be recording artist Katie Melua, the Westminster Abbey choristers and a maritime folk band from Cornwall, the Fisherman's Friends, who said the chance to take part was "the icing on the cake for us."
This annual carol service will be aired by television on December 24th.
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