Princess of scales! Charlotte joins Kate for special Christmas piano duet

The Princess of Wales and her daughter Charlotte have teamed up for a 'special' piano duet - with the stunning performance airing on Kate's star-studded Christmas carol concert.The royal duet delighted fans during the opening segment of the programme - 'Together at Christmas'.It was shown alongside a voiceover of Kate reading the letter that was given to guests at Westminster Abbey, and footage of people arriving for the service on December 5.Kate, 43, and 10-year-old Princess Charlotte played Holm Sound by Erland Cooper - a Scottish composer and producer from the Orkney Islands - whose work is inspired by nature and connection, themes which are of deep importance to the Princess of Wales.