It was a festive night for the royals.

During Kate Middleton’s annual “Together at Christmas” carol service in London on Friday night, she and Prince William’s three kids joined in on the holiday cheer.

Attendees could line the Christmas tree outside Westminster Abbey with their names and notes, which is exactly what Prince George, 12, Princess Charlotte, 10, and Prince Louis, 7, did.

The royal children were pictured writing their names on paper and adding it to the tree, while the Prince and Princess of Wales, both 43, observed.

For the fifth annual service, Middleton went with the theme of “love in all its forms.”

The event was held at the same location where the prince and princess tied the knot in 2011.

“So special to come together this evening for this year’s ‘Together at Christ

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