Kate, the Princess of Wales, and her daughter Princess Charlotte have played a piano duet to open this year's Christmas Carol Service.
The British royals sat side by side as they played an excerpt from Holm Sound by Scottish composer Erland Cooper at Westminster Abbey.
The pre-recorded video aired on British television on Christmas Eve.
"At its heart, Christmas speaks of love taking form in the simplest, most human ways," Princess Kate said in a voiceover.
"Not in sentimental or grand gestures, but gentle ones, a moment of listening, a word of comfort, a friendly conversation, a helping hand. Presence.
"These simple acts of care might seem small, but they contribute to the beautiful tapestry of life to which we all belong."
The voiceover was interspersed with footage of the royal family – including Prince William and Charlotte's brothers, George and Louis – as they helped decorate a public Christmas tree.
Princess Kate continued: "At a time when life can sometimes feel fragmented or uncertain, the Christmas season invites us to remember the power of reaching out to one another with generosity of heart, understanding and hope.
"As the year draws to a close, I hope this season brings you moments of peace and clarity and that you, too, feel surrounded by the same love and care that you offer so freely.
"Thank you for the warmth you have given and the kindness you have shown, and the quiet, constant light you bring to others. Wishing you a very happy Christmas."
King Charles will deliver his Christmas message later this evening.
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