Kate, Duchess of Cambridge, 38, dazzled alongside Prince William, 37, and their three adorable youngsters as they made a surprise TV appearance to Clap for the NHS on Thursday night. Birthday boy Prince Louis, two, Prince George, six, and Princess Charlotte, four, joined their parents as they took part in the Clap for the Carers campaign from the doorstep of Anmer Hall.

The special clip was shown BBC One’s The Big Night In and followed Prince William’s comedy debut in a sketch alongside Blackadder actor Stephen Fry.

The family shared the adorable clip on their Kensington Royal Instagram account with the caption.

“This evening The Duke and Duchess of Cambridge, Prince George, Princess Charlotte and Prince Louis joined the UK in the weekly #ClapForOurCarers to show their appreciation for the incredible key workers working tirelessly to keep the country running.

“Ahead of the 8pm clap The Duke joined #Blackadder’s General Melchett (aka @StephenFryactually) for some video call fun on the @BBC’s Big Night In.”

READ MORE: Kate Middleton makes sweet nod to Princess Diana as she claps for NHS.

Prince George wore a blue and white checked shirt while little Louis was in a navy blue ensemble.

Princess Charlotte’s gorgeous pale blue floral dress had fashion fans swooning too.

Princess Charlotte will celebrate her fifth birthday next weekend and royal fans are hopeful new pictures of her will be released to mark the milestone.

Mum Kate is a talented photographer and shared new portraits of Louis playing with rainbow paints to mark his second birthday on Thursday.

The adorable snaps were shared across the royal social media accounts and captured Louis in the process of making a rainbow handprint tribute for the NHS.