The exciting video, posted to the Prince and Princess of Wales' joint X account this morning, pans across a festively decorated room to show two hands, one with a large ring, resting on a piano.

Princess Kate Middleton's annual "Together at Christmas" carol service featured an extra-special performance.

In advance of Princess Kate's Christmas carol performance this evening, Kensington Palace has hinted at a "special duet" in a video featuring two sets of fingers on piano keys