Catherine, Princess of Wales, is presiding over her annual festive musical service at Westminster Abbey, with guests including members of the royal family, famous faces, and community champions who have helped their communities.
The sizable congregation will hear a selection of traditional hymns, orchestral pieces, and literary excerpts from stars like Kate Winslet and Chiwetel Ejiofor.
The focus of the event, held in the glowing Westminster Abbey on the afternoon, is generosity and expressing affection towards one's neighbour.
Attending the event are Anna and Jonathan Cordiner, whose daughter died of a tumour, and who set up a charity, a charity called Kayleigh's Wee Stars, to aid parents with 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," the Princess expressed in a note prior to the festive gathering.
The Princess of Wales is continuing her own steady comeback to public life following her health challenges and treatment, in November making her first public speech for two years, in which she reflected on recognising the "discreet, frequently unseen labour of caregivers".
Attendees entering the Abbey will enjoy performances from budding artists supported by the charitable trust Future Talent, co-founded by the late Duchess of Kent to increase availability of musical tuition.
An 18-year-old named Carys Wood, who plays the trumpet and is from southwest Wales, has been assisted by the organisation, with funding assisting with equipment, teaching, and travel fees - and she said it was "incredible" to be performing at the evening's event.
"Musical pursuits are frequently pricey," the musician remarked. She is now enrolled at the prestigious music academy, and added that "all people deserve the chance" to cultivate their performance abilities.
Eliza, Carys's sister who is 11, who plays the euphonium, will also be at the Abbey. "I never thought I'd be able to play there in front of so many notable figures," she said.
Attending the service will be individuals spanning multiple eras.
That will feature young Saphia Turner, nine, recipient of a youth community award, who produces drawings and undertakes charity feats 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.
Among the musical performers will be recording artist Katie Melua, choristers from Westminster Abbey and a maritime folk band from Cornwall, Fisherman's Friends, who said the opportunity to perform was "the perfect culmination."
The festive event titled 'Together at Christmas' will be broadcast on television on December 24th.