Her Royal Highness has organised her yearly Christmas carol concert at the historic Abbey, with attendees featuring members of the royal family, famous faces, and community champions who have made a difference in their neighbourhoods.
The 1,600 guests will listen to a selection 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 compassion and demonstrating care for others.
In the audience are Anna and Jonathan Cordiner, whose child passed away from a tumour, and who established a foundation, Kayleigh's Wee Stars, to aid parents with a terminally ill child.
"The time, care and compassion you give, often discreetly and without words, and without any thought of thanks or praise, make an remarkable change to the well-being of people," the Princess expressed in a note prior to the festive gathering.
The Princess of Wales is continuing her own gradual return to official duties subsequent to her illness and medical care, in November making her initial major address in two years, in which she talked about recognising the "selfless, commonly overlooked efforts of carers".
Guests arriving at the Abbey will be entertained by young musicians aided by the charitable trust Future Talent, established in part by the Duchess of Kent to broaden opportunities for instrumental training.
Trumpeter Carys Wood, 18, who plays the trumpet and is from Wales, has been helped by the trust, with funding assisting with equipment, teaching, and travel fees - and she said it was "amazing" to be performing at tonight's service.
"Pursuing music is often costly," the musician remarked. She is now enrolled at the renowned conservatoire, and added that "each individual ought to be given the possibility" to hone their artistic talents.
Her younger sibling Eliza, aged 11, who performs on the brass instrument, will also be at the Abbey. "It's unbelievable that I get to perform here in front of so many distinguished guests," she said.
Attending the service will be individuals spanning multiple eras.
That will feature young Saphia Turner, nine, honouree of a young hero award, who sells artwork and carries out sponsored challenges to raise money for local food charities.
The Abbey has been adorned with handcrafted festive wreaths, with TV cook Mary Berry and florist Simon Lycett assisting in their creation.
Taking to the stage will be Katie Melua, choristers from Westminster Abbey and a maritime folk band from Cornwall, the Fisherman's Friends, who said the opportunity to perform was "the perfect culmination."
This annual carol service will be aired by ITV1 on Christmas Eve.
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