Prince William has impressed royal fans today as he has featured on a new TV series. The Prince of Wales, 43, appeared on The Reluctant Traveller with Canadian actor Eugene Levy, 78, with the pair spending time together in Windsor.

As well as giving Eugene a tour of Windsor Castle and the grounds, William also treated the actor to a quick pint at a local pub. It was here where the prince got candid about a number of things, with one being his wife Princess Kate’s health.

While talking about how “great” it is now she is in remission, William also addressed how Kate’s cancer journey last year impacted the family, showing visible emotion as he spoke about this.

Speaking exclusively to Express.co.uk, body language expert Judi James has now said the moment where William seems to be emotional is “unbearably sad to watch”, especially as he never usually displays such personal emotions in public.

She said: “Unlike his brother, Prince William has clearly inherited the stoic gene that he talks about when referring to his 'stoic & resilient' royal relatives .He impersonalizes these rather tragic references by generalizing verbally, referring to how 'you' cope rather than focusing on himself.

“His eyes look down a lot to protect and shield his inner feelings but when he does look up they are pink and watery, showing a hint of tears that he is clearly at pains to suppress. There is a wry smile of fondness as he mentions his grandparents and how long they lived but we can see the furrows of concern etched between his brows.

“He mimes the rug being 'pulled from under your feet' in what looks like an act of distraction because it's here that the emotions threaten to overwhelm him. He strives to be seen as positive, tapping his index finger onto the side of his forehead but the gesture becomes a self-comfort scratching.”

She continues: “As he says you think it 'won't happen to you' his voice chokes a little and he scratches at his beard in another self-comfort ritual before he clears his throat in a bid to carry on.

“William is not a man given to over-sharing his emotions in public and it's possibly this that makes this moment so unbearably sad to watch.

“He shows vulnerability but without acting vulnerable and instead trying to focus on the positives but in the end it's the powerful emotions that win here.”

Episode four of The Reluctant Traveller With Eugene Levy, called Living the Royal Life in the UK, is available to watch on Apple TV+.