Her Royal Highness has organised her customary Christmas carol concert at the historic Abbey, with guests including royals, celebrities and local heroes who have made a difference in their neighbourhoods.
The sizable congregation will enjoy a mix of festive songs, musical performances, and spoken word pieces from performers including Chiwetel Ejiofor and Kate Winslet.
The theme of the concert, held in the glowing Westminster Abbey on the afternoon, is kindness and showing love to others.
In the audience are Jonathan and Anna Cordiner, whose child passed away from a brain tumour, and who established a foundation, a support fund, to support families who have a terminally ill child.
"The time, care and compassion you give, often discreetly and without words, and without any expectation or recognition, make an remarkable change to the circumstances of individuals," Her Royal Highness stated in a note prior to the festive gathering.
The royal has been undertaking her own measured re-emergence to public life subsequent to her illness and medical care, in November making her first public speech for two years, in which she talked about recognising the "quiet, often invisible work of caring".
Attendees entering the Abbey can listen to talented youth performers backed by the Future Talent organisation, set up with the help of the former royal to increase availability of instrumental training.
Trumpeter Carys Wood, 18, who plays the trumpet and is from Wales, has been assisted by the organisation, with grants helping towards instruments, tuition, and transportation expenses - and she said it was "awesome" to be performing at tonight's service.
"Musical pursuits are frequently pricey," she stated. She is now enrolled at the prestigious music academy, and added that "each individual ought to be given the possibility" to cultivate their performance abilities.
Her younger sibling Eliza, aged 11, who performs on the brass instrument, will likewise attend the Abbey. "It's unbelievable that I get to perform here in front of so many notable figures," she said.
Attending the service will be individuals spanning multiple eras.
That will encompass Saphia Turner, aged nine, honouree of a prize for youthful altruism, who produces drawings and undertakes charity feats to raise money for local food charities.
The Abbey has been adorned with handcrafted festive wreaths, with well-known chef Mary Berry and flower expert Simon Lycett helping to make them.
Among the musical performers will be singer Katie Melua, the Abbey's own choir and a nautical singing ensemble, the Fisherman's Friends, who said the opportunity to perform was "the perfect culmination."
The festive event titled 'Together at Christmas' will be televised and shown on a major network on Christmas Eve.
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