While watching Elena Rybakina and Ons Jabeur, the royal, 40, was just three rows in front of the actor, 60.
Scroll through the gallery below to see more photos from the outing!
Meanwhile, the mom-of-three — who shares Prince George, 8, Princess Charlotte, 7, and Prince Louis, 4, with Prince William — looked gorgeous in a polka dot frock.
"Another year, another incredible tournament here @wimbledon. Congratulations to @djokernole on becoming Men’s singles Champion again today and to all the players who participated over the past two weeks. Last but not least, to the staff, team and community who make this special event happen 👏🎾🍓," she wrote on Instagram.
The Hollywood star, who is friendly with William and Kate, was also in the stands on Sunday, June 10.
"I think she's someone who has tremendous dignity and I admire her devotion," he continued.
"What she's accomplished has been historic ... I have great respect for her and when they asked [me to take part in this event] I said instantly, 'it would be my honor' to be here," he gushed.
Kate, who wore a yellow dress on July 10, also handed out trophies on both days. "A beautiful day for a brilliant match. Congratulations to both players but also to all the unsung heroes that make this tournament what it is. @Wimbledon you make us proud each and every year!" she wrote.
For more on the royal family's trials and tribulations, tune into the new podcast "The Firm: Blood, Lies and Royal Succession." Listen below!