For the occasion, the Duchess of Cambridge chose a beautiful red coat dress.
For jewellery, the Duchess donned her sapphire engagement ring and matching dangling earrings.
She also accessorised the look with her £640 Miu Miu bag.
For today’s occasion, she opted to wear her brunette hair down and was seen carrying a black face mask.
The mother-of-three was all smiles as she chatted to other guests at the Christmas carol service.
The Together At Christmas event in London is celebrated to honour the pandemic heroes such as charity workers, teachers and other volunteers.
The Duke and Duchess of Cambridge were joined by Sophie, Countess of Wessex.
Sophie donned white trousers and a green blouse which she combined with a maroon jacket.
The royals were also joined by Kate’s family.
Twitter user Jennifer Ames said: “Gorgeous matching.”
Avril Hyndman commented: “Stunning!” while Elena Green said: “I think red is becoming Kate’s iconic colour.
“She wears all colours but wearing head to toe bright red as often as she does is bold and confident.”
User Lucky Traveler Boutique agreed: “Love this look!”