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Princess Eugenie posted online about missing Kate Middleton's Christmas carol service

PEOPLE understands that Princess Eugenie and her sister, Princess Beatrice, were invited to the festive event in early autumn

The former Prince Andrew's daughters were unable to attend because of other commitments

Princess Eugenie shared an unexpected message after she and her sister, Princess Beatrice , missed Kate Middleton 's "Together at Christmas" carol service.

The Princess of Wales, 43, held her fifth annual Christmas concert at Westminster Abbey in London on Dec. 5. While many members of the royal family were among the guests, Prince William 's cousins Beatrice and Eugenie didn't attend as they have in years past.

PEOPLE understands that Princess Beatrice and Princess Eug

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