And proving they really are just like us, the Cambridge's were seen having what appeared to be a picnic out of the boot of their car.
Kate, who looked stunning in a pink summery dress and wedges, could be seen sitting on the grass with a playful Prince Louis while Prince George and Princess Charlotte sat enjoying some snacks.
Kate and the kids were joined by the Duchess of Sussex who took adorably baby Archie to cheer on his dad Prince Harry who was also playing in the match.
At one point, Meghan was seen planting a sweet kiss on Archie as she held him close.
William and Harry played for the Khun Vichai Srivaddhanaprabha Memorial Polo Trophy at Billingbear Polo Club on Wednesday July 10.
The match will raise funds for charities supported by both William and Harry.