Her Royal Highness has organised her annual festive musical service at Westminster Abbey, with attendees featuring royals, celebrities and local heroes who have made a difference in their neighbourhoods.
The large audience will listen to a blend of carols, music and readings from stars like Kate Winslet and Chiwetel Ejiofor.
The focus of the concert, held in the candle-lit Abbey on the afternoon, is compassion and demonstrating care for others.
In the audience are a couple named the Cordiners, whose young girl was lost to a brain tumour, and who established a foundation, Kayleigh's Wee Stars, to aid parents with a youngster facing a life-limiting condition.
"Your efforts, love, and understanding, often discreetly and without words, and without any expectation or recognition, make an remarkable change to the circumstances of individuals," wrote Catherine in a note prior to the festive gathering.
The Princess of Wales is continuing her own steady comeback to public life subsequent to her illness and medical care, recently giving her major oration since 2023, in which she reflected on recognising the "quiet, often invisible work of caring".
Those coming to the Abbey will enjoy performances from talented youth performers backed by the Future Talent charity, co-founded by the late Duchess of Kent to increase availability of instrumental training.
An 18-year-old named Carys Wood, who plays the trumpet and is from Pembrokeshire, has been supported by the organisation, with funding assisting with equipment, teaching, and travel fees - and she said it was "incredible" to be taking part in tonight's service.
"Musical pursuits are frequently pricey," Carys said. She is now studying at the prestigious music academy, and added that "all people deserve the chance" to hone their artistic talents.
Her younger sibling Eliza, aged 11, who is a euphonium player, will also be at the Abbey. "I never thought I'd be able to play there in front of so many important people," she said.
Within the audience will be representatives of different generations.
That will feature Saphia Turner, aged nine, honouree of a youth community award, who produces drawings and undertakes charity feats to generate funds for community pantries.
The Abbey has been adorned with handcrafted festive wreaths, with celebrity baker Mary Berry and floral designer Simon Lycett helping to make them.
The musical lineup includes recording artist Katie Melua, choristers from Westminster Abbey and a maritime folk band from Cornwall, the group Fisherman's Friends, who said the opportunity to perform was "a dream come true."
This annual carol service will be televised and shown on television on December 24th.