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The couple were watching Cameron Norrie's match against Belgium's David Goffin, but as the tense match got underway, Prince William appeared to be on the edge of his seat.
In fact, in one video of the couple, William seems to be almost swearing, mouthing: "Oh no, no, not…F…"
While the camera panned away just in time, the clips have been shared on Twitter by fans. Take a look at one below...
And social media users have a lot of thoughts on the videos, with some finding them hilarious with others adamant that Wills would never swear.
One person wrote: "He would never use the f word," while another commented: "Not Prince William."
A third added: "He is saying no, no fudge is my fave."
Others saw the funny side, with one adding: "Duke Cambridge has his moment like the rest of us a slip of the tongue."
While another said: "That’s gold!"
"I love Prince William so much. Any tennis fan would understand his reaction."
Following their attendance at Wimbledon, Kate and Will took to social media to post about their day.
"What a match! Just brilliant @cam_norrie," they wrote, later adding: "What a day of tennis! Fantastic to be back @Wimbledon today and wonderful to see @Cam_Norrie flying the flag in the singles!"
In other Wimbledon news, people have been left shocked over how much food and drink costs at the annual tennis event.
For example, Twitter account Sport Scran has revealed that a tray of chicken and chips with a side of coleslaw will set you back a staggering £11.
In the comments section, another Wimbledon attendee also shared that their pint cost £7.10.
However, those hoping to get their hands on the famous strawberries and cream will be happy to know they have remained at the same price of £2.50 since 2010.
The All England Club's chief executive Sally Bolton told LADbible: "Like every other business our costs are increasing across the board so we’re having to balance that challenge. As much as we can we’re trying not to pass that on to the consumer."
Bolton added: "One of the most iconic parts of our food and drink offer, strawberries, are kept at £2.50 and have been now since 2010, so we’ve retained those at an accessible price despite input prices going up.”