Her Royal Highness has organised her yearly Yuletide celebration at Westminster Abbey, with guests including royals, celebrities and local heroes who have supported their local areas.
The 1,600 guests will listen to a blend of carols, music and readings from stars like Kate Winslet and Chiwetel Ejiofor.
The focus of the event, held in the atmospheric historic church on Friday afternoon, is generosity and expressing affection towards one's neighbour.
Among the guests will be Anna and Jonathan Cordiner, whose young girl was lost to a tumour, and who established a foundation, a charity called Kayleigh's Wee Stars, to aid parents with a youngster facing a life-limiting condition.
"The time, care and compassion you give, often quietly and unspoken, and without any thought of thanks or praise, make an extraordinary difference to the well-being of people," wrote Catherine in a message before the carol service.
The Princess of Wales is continuing her own steady comeback to the public eye subsequent to her illness and medical care, last month delivering her initial major address in two years, in which she discussed recognising the "discreet, frequently unseen labour of caregivers".
Attendees entering the Abbey will enjoy performances from young musicians backed by the Future Talent organisation, established in part by the former royal to increase availability of musical tuition.
Carys Wood, aged 18, who plays the trumpet and is from southwest Wales, has been supported by the organisation, with funding assisting with instruments, tuition, and transportation expenses - and she said it was "amazing" to be performing at the concert.
"Pursuing music is often costly," the musician remarked. She is now enrolled at the Royal Academy of Music, and added that "everyone should have the opportunity" to develop their musical skills.
Carys's 11-year-old sister, Eliza, who plays the euphonium, will also be at the Abbey. "I never imagined I would perform in front of so many distinguished guests," she said.
Among the guests will be individuals spanning multiple eras.
That will feature nine-year-old Saphia Turner, winner of a youth community award, who sells artwork and carries out sponsored challenges to generate funds for community pantries.
The Abbey has been festooned with handcrafted festive wreaths, with TV cook Mary Berry and florist Simon Lycett helping to make them.
The musical lineup includes singer Katie Melua, the Westminster Abbey choristers and a maritime folk band from Cornwall, the group Fisherman's Friends, who said the chance to take part was "the perfect culmination."
This annual carol service will be aired by ITV1 on Christmas Eve.
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