The couple, who wed at St. George's Chapel in Windsor in October 2018, are also firm friends with Eugenie's cousin, Prince Harry.
It's widely known that the cousins have a close bond and Eugenie took a trip out to the States to see Harry, which was shown during their Netflix series.
What's lovelier is that Harry's daughter, Princess Lilibet, who he shares with his wife Meghan Markle, has a strong resemblance to Princess Eugenie's eldest, August.
Click through the gallery to see how similar the two young royal cousins look…
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Princess Eugenie's eldest son, August's resemblance to Prince Harry's daughter
Prince Harry and Meghan released this photo of Lilibet the year she turned one, and it's the one photo that we think truly shows the resemblance between the cousins.
The youngest of the Duke and Duchess of Sussex is now three so is the same age as little August.
We haven't seen Lilibet in recent times as Harry and Meghan mostly keep their two children away from the spotlight, but we bet they've become even more similar as the years have gone on.
This photo of August was taken in the summer of 2022 during the Queen's Platinum Jubilee celebrations, so Eugenie's son would have turned one the February prior.
Looking at this photo alongside the photo of Lili at the same age, the two adorable kids' faces are strikingly similar, not to mention the fantastic flame-coloured hair.
Not only does August bear a resemblance to Lilibet, but his waved hair reminds us of Harry and Meghan's eldest, Prince Archie.
We've not seen a huge amount of Archie other than the odd glimpse of him during the Sussexes Netflix documentary, but this photo shows off Archie's adorable curls.