The Princess of Wales is hosting her yearly festive musical service at the historic Abbey, with guests including royals, celebrities and local heroes who have supported their local areas.
The large audience will listen to a selection of festive songs, musical performances, and spoken word pieces from actors such as Kate Winslet and Chiwetel Ejiofor.
The focus of the event, held in the glowing Westminster Abbey on Friday afternoon, is kindness and showing love to others.
In the audience are a couple named the Cordiners, whose child passed away from a brain tumour, and who established a foundation, a charity called Kayleigh's Wee Stars, to support families who have a youngster facing a life-limiting condition.
"The time, care and compassion you give, often discreetly and without words, and without any thought of thanks or praise, make an remarkable change to the circumstances of individuals," Her Royal Highness stated in a message before the carol service.
The royal has been undertaking her own gradual return to public life after her cancer diagnosis and chemotherapy, recently giving her first public speech for two years, in which she reflected on recognising the "selfless, commonly overlooked efforts of carers".
Guests arriving at the Abbey will enjoy performances from budding artists supported by the Future Talent charity, established in part by the former royal to widen access to instrumental training.
Carys Wood, aged 18, who is a trumpet player and is from Pembrokeshire, has been assisted by the charity, with grants helping towards equipment, teaching, and travel fees - and she said it was "awesome" to be playing at the evening's event.
"Musical pursuits are frequently pricey," the musician remarked. She is now a student at the Royal Academy of Music, and added that "each individual ought to be given the possibility" to hone their artistic talents.
Carys's 11-year-old sister, Eliza, who is a euphonium player, will also be at the Abbey. "It's unbelievable that I get to perform here in front of so many distinguished guests," she said.
Among the guests will be individuals spanning multiple eras.
That will feature Saphia Turner, aged nine, honouree of a youth community award, who creates and sells art and completes fundraising tasks to raise money for community pantries.
The Abbey has been adorned with custom-created holiday decorations, with celebrity baker Mary Berry and floral designer Simon Lycett contributing to their design.
The musical lineup includes Katie Melua, choristers from Westminster Abbey and a nautical singing ensemble, the group Fisherman's Friends, who said the invitation to sing was "a dream come true."
The festive event titled 'Together at Christmas' will be televised and shown on television on December 24th.
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