Princess Charlotte is stepping into some very big shoes.

The 10-year-old daughter of Prince William and Kate Middleton joined her parents—along with siblings Prince George , 12, and Prince Louis , 7—for the Together At Christmas Carol Service at London’s Westminster Abbey Dec. 5, where she donned an ensemble that evoked her late grandmother Princess Diana .

During the royal outing, Charlotte stepped out in a velvet long-sleeve navy blue dress with a white collar, along with navy tights and a pair of dark flats. The outfit closely resembled a similar getup which Diana—who died in 1997—wore to a dinner at Royal Festival Hall in December 1981.

The event, which will air in the U.K. on Christmas Eve, was also attended by several members of the royal family including

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