Catherine, Princess of Wales, is presiding over her yearly festive musical service at the iconic London venue, with a congregation comprising dignitaries, stars, and everyday helpers who have helped their communities.
The sizable congregation will enjoy a blend of traditional hymns, orchestral pieces, and literary excerpts from actors such as Kate Winslet and Chiwetel Ejiofor.
The theme of the event, held in the glowing Westminster Abbey on Friday afternoon, is kindness and showing love to others.
Among the guests will be Anna and Jonathan Cordiner, whose child passed away from a tumour, and who established a foundation, a support fund, to support families who have a terminally ill child.
"Your efforts, love, and understanding, often without fanfare or recognition, and without any hope for reward or acknowledgement, make an extraordinary difference to the lives of others," Her Royal Highness stated in a letter ahead of the concert.
The royal has been undertaking her own measured re-emergence to public life following her health challenges and treatment, recently giving her initial major address in two years, in which she discussed recognising the "selfless, commonly overlooked efforts of carers".
Those coming to the Abbey will be entertained by talented youth performers backed by the Future Talent organisation, established in part by the former royal to increase availability of instrumental training.
Carys Wood, aged 18, who performs on the trumpet and is from Wales, has been helped by the charity, with grants helping towards musical instruments, lessons and travel costs - and she said it was "amazing" to be playing at the concert.
"Pursuing music is often costly," the musician remarked. She is now a student at the prestigious music academy, and added that "everyone should have the opportunity" to hone their artistic talents.
Eliza, Carys's sister who is 11, who plays the euphonium, will be present at the Abbey. "It's unbelievable that I get to perform here in front of so many notable figures," she said.
Among the guests will be representatives of different generations.
That will encompass Saphia Turner, aged nine, honouree of a youth community award, who creates and sells art and completes fundraising tasks to generate funds for local food charities.
The Abbey has been festooned with handcrafted festive wreaths, with TV cook Mary Berry and florist Simon Lycett helping to make them.
The musical lineup includes Katie Melua, the Abbey's own choir and a Cornish sea shanty group, the Fisherman's Friends, who said the chance to take part was "the perfect culmination."
The festive event titled 'Together at Christmas' will be broadcast on television on December 24th.
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