The Mail on Sunday can reveal that Kate, with Prince William and their children Prince George, Princess Charlotte and Prince Louis, enjoyed a break in the Alps.
When the service was filmed on December 6, Kate said that she had enlisted Prince Louis, six, to keep the performance by soloists from the Royal Ballet as a surprise for her daughter.
The young royal, nine, won hearts across the nation through her sweet enjoyment of the service, giggling at various moments alongside her brothers Prince George, 11, and Prince Louis , six.