Princess Charlotte, meanwhile, looked like her mothers mini-me in a burgundy coat dress and navy tights.

George and Louis wore coordinating navy blue suits and red tiesmuch like their father, Prince William.

She, in turn, helped her elder brother, Prince George.

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Prince George of Wales, Princess Charlotte of Wales, and Prince Louis of Wales attend the Together at Christmas Carol Service at Westminster Abbey on December 6 in London.

While any appearance from the full Wales family is notable, this one felt particularly significant.

Yet, in the past month, shes slowly but surely returned to public life after completing chemotherapy.

You could say it must be a very happy holiday indeed for the Waleses.

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Photo: Getty Images

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Prince George, Princess Charlotte, and Prince Louis arrive at Westminster Abbey.