Kate, who is expecting her third child, and the rest of the family coordinated in blue outfits.
Earlier this month, Kate handed out Christmas presents and helped set up for a Christmas party at Rugby Portobello Trust, a charity that helps young people.
William revealed earlier that George played a sheep in his school's nativity play. The 4-year-old heir to the throne asked for a police car in a letter to Santa, William said.
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