Her Royal Highness has organised her annual festive musical service at Westminster Abbey, with attendees featuring royals, celebrities and local heroes who have supported their local areas.
The sizable congregation will enjoy a blend of traditional hymns, orchestral pieces, and literary excerpts from performers including Chiwetel Ejiofor and Kate Winslet.
The central message of the concert, held in the atmospheric historic church on Friday afternoon, is compassion and demonstrating care for others.
In the audience are Anna and Jonathan Cordiner, whose child passed away from a tumour, and who set up a charity, Kayleigh's Wee Stars, to help households where there is a terminally ill child.
"Your efforts, love, and understanding, often discreetly and without words, and without any thought of thanks or praise, make an profound impact to the well-being of people," wrote Catherine in a note prior to the concert.
The princess has been making her own measured re-emergence to public life subsequent to her illness and medical care, recently giving her initial major address in two years, in which she talked about recognising the "discreet, frequently unseen labour of caregivers".
Those coming to the Abbey can listen to talented youth performers supported by the Future Talent charity, set up with the help of the former royal to broaden opportunities for instrumental training.
An 18-year-old named Carys Wood, who plays the trumpet and is from Wales, has been supported by the trust, with funding assisting with equipment, teaching, and travel fees - and she said it was "incredible" to be playing at the evening's event.
"Pursuing music is often costly," the musician remarked. She is now studying at the prestigious music academy, and added that "all people deserve the chance" to hone their artistic talents.
Eliza, Carys's sister who is 11, who performs on the brass instrument, will likewise attend the Abbey. "I never imagined I would perform in front of so many notable figures," she said.
Among the guests will be people from various age groups.
That will include nine-year-old Saphia Turner, recipient of a prize for youthful altruism, who sells artwork and carries out sponsored challenges to collect donations for food banks.
The Abbey has been decorated with custom-created holiday decorations, with celebrity baker Mary Berry and floral designer Simon Lycett contributing to their design.
The musical lineup includes singer Katie Melua, the Abbey's own choir and a Cornish sea shanty group, 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 ITV1 on Christmas Eve.
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