Catherine, Princess of Wales, is presiding over her yearly Christmas carol concert at Westminster Abbey, with a congregation comprising dignitaries, stars, and everyday helpers who have helped their communities.
The large audience will listen to a selection of festive songs, musical performances, and spoken word pieces from stars like award-winning actors.
The central message of the event, held in the atmospheric historic church on the afternoon, is generosity and expressing affection towards one's neighbour.
Attending the event are a couple named the Cordiners, whose child passed away from a tumour, and who set up a charity, Kayleigh's Wee Stars, to aid parents with a youngster facing a life-limiting condition.
"The time, care and compassion you give, often without fanfare or recognition, and without any hope for reward or acknowledgement, make an profound impact to the circumstances of individuals," the Princess expressed in a note prior to the festive gathering.
The Princess of Wales is continuing her own steady comeback to the public eye following her health challenges and treatment, last month delivering her first public speech for two years, in which she reflected on recognising the "discreet, frequently unseen labour of caregivers".
Those coming to the Abbey will enjoy performances from young musicians backed by the Future Talent charity, set up with the help of the late Duchess of Kent to broaden opportunities for instrumental training.
Trumpeter Carys Wood, 18, who performs on the trumpet and is from Pembrokeshire, has been helped by the organisation, with funding assisting with musical instruments, lessons and travel costs - and she said it was "awesome" to be playing at tonight's service.
"Pursuing music is often costly," the musician remarked. She is now studying at the renowned conservatoire, and added that "all people deserve the chance" to hone their artistic talents.
Carys's 11-year-old sister, Eliza, 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 important people," she said.
Attending the service will be individuals spanning multiple eras.
That will encompass Saphia Turner, aged nine, recipient of a prize for youthful altruism, who sells artwork and carries out sponsored challenges to generate funds for community pantries.
The Abbey has been decorated with handcrafted festive wreaths, with TV cook Mary Berry and florist Simon Lycett assisting in their creation.
Among the musical performers will be recording artist Katie Melua, the Westminster Abbey choristers and a nautical singing ensemble, the Fisherman's Friends, who said the invitation to sing was "a dream come true."
The festive event titled 'Together at Christmas' will be aired by a major network on Christmas Eve.
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