The Princess of Wales is hosting her customary festive musical service at the iconic London venue, with attendees featuring members of the royal family, famous faces, and community champions who have made a difference in their neighbourhoods.
The sizable congregation will hear a mix of festive songs, musical performances, and spoken word pieces from stars like award-winning actors.
The theme of the concert, held in the candle-lit Abbey on Friday, is compassion and demonstrating care for others.
Among the guests will be Anna and Jonathan Cordiner, whose daughter died of a brain tumour, and who founded an organisation, a support fund, to aid parents with a terminally ill child.
"The dedication, empathy, and kindness you show, often discreetly and without words, and without any thought of thanks or praise, make an extraordinary difference to the circumstances of individuals," wrote Catherine in a letter ahead of the concert.
The princess has been making her own gradual return to the public eye following her health challenges and treatment, in November making her initial major address in two years, in which she discussed recognising the "quiet, often invisible work of caring".
Those coming to the Abbey can listen to young musicians aided by the Future Talent charity, co-founded by the late Duchess of Kent to increase availability of music lessons.
Trumpeter Carys Wood, 18, who performs on the trumpet and is from Wales, has been supported by the charity, with grants helping towards musical instruments, lessons and travel costs - and she said it was "amazing" to be taking part in tonight's service.
"Music can be very expensive," the musician remarked. She is now a student at the prestigious music academy, and added that "each individual ought to be given the possibility" to cultivate their performance abilities.
Eliza, Carys's sister who is 11, who is a euphonium player, will likewise attend the Abbey. "I never imagined I would perform in front of so many notable figures," she said.
Among the guests will be individuals spanning multiple eras.
That will encompass Saphia Turner, aged nine, honouree of a young hero award, who creates and sells art and completes fundraising tasks to collect donations for local food charities.
The Abbey has been festooned with custom-created holiday decorations, with celebrity baker Mary Berry and floral designer Simon Lycett assisting in their creation.
The musical lineup includes recording artist Katie Melua, choristers from Westminster Abbey and a nautical singing ensemble, the group Fisherman's Friends, who said the opportunity to perform was "the icing on the cake for us."
The festive event titled 'Together at Christmas' will be broadcast on television on December 24th.
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