India, Dec. 25 -- A video of Kate Middleton, the Princess of Wales, and her daughter, Princess Charlotte, came as a sweet surprise for the fans. In a Christmas message from the royal household, the mother and daughter teamed up for a special piano performance. They played a rendition of Holm Sound by Erland Cooper.

"The Princess of Wales and Princess Charlotte play the piano together as part of the introduction to 'Together at Christmas' Carol Service," read a part of the YouTube caption posted on the channel dedicated to The Prince and Princess of Wales.

"In the piece, Their Royal Highnesses play Holm Sound by Erland Cooper, a Scottish composer, producer and multi-instrumentalist, originally from the Orkney Islands, whose work is inspi...