Watch Kate Middleton's Impressive Piano Performance at Royal Christmas Concert

Kate Middleton is full of surprises! The 39-year-old Duchess of Cambridge impressed viewers around the world when she took a seat at the piano inside The Chapter House at Westminster Abbey in London. Kate performed alongside Scottish musician Tom Walker, who sang the tune ‘For Those Who Can't Be Here,’ during the special service, 'Royal Carols: Together at Christmas.' The performance was taped earlier this month, but aired over the holiday weekend.