Kate Middleton and Princess Charlotte piano video elicits reaction from Jennifer Garner

Kate Middleton and her daughter Princess Charlotte performed a piano duet together for a Christmas carol service last week.

Their performance of a piece of music by Scottish composer Erland Cooper was pre-recorded at Windsor Castle specifically for the event's Christmas Eve broadcast on ITV1.

Kensington Palace had teased the clip ahead of the programme with a video of Catherine and a then unknown person playing the piano captioned "a special duet."

A clip of their performance was later shared on the official Instagram account of the Prince and Princess of Wales with the caption, "Love and connection through music. A special duet playing Holm Sound by Erland Cooper to open this year’s ‘Together at Christmas’ Carol Service."

More than 370,000 people have liked the video on Instagram within five days after it was shared by Kensington Palace on Prince William and Kate Middleton's account.

Prominent among those who liked Kate and Charlotte's performance were Hollywood stars Jennifer Garner and Hugh Jackman.