The two doubles attempted to fool viewers into thinking the real Royal couple had made a snap decision to appear on Let's Do Lunch with Gino and Mel with their newborn son.
Posing with a fake baby, Simon Watkinson and Heidi Agan did their best impression of Kate and Wills and were even dressed up in identical clothing as they had afternoon tea with hosts Gino D'Acampo and Melanie Sykes.
On closer inspection, the professional look-a-likes may be a little familiar to some, as they have previously recreated a few classic Royal moments, including scenes that we normally wouldn't get to see between the Duke and Duchess of Cambridge.
You may recognise Simon in particular, as he has been dubbed as 'the world's best Prince William look-alike' after starring in the T-Mobile Royal Wedding Dance video, which has now reached more than 27 million viewers on YouTube.
Meanwhile, the original Kate and Wills made their first appearance with their new son yesterday evening (23 July). They have now left Kensington Palace and are at Kate's parents' home in Berkshire.
How convincing are these look-a-likes?! Let us know if they fooled you, as the best comment from across the website each week wins £50!/strong>
Watch Simon in the Royal Wedding Dance T-Mobile video below.