For her first appearance in the box, alongside sister-in-law the Duchess of Cambridge, Prince Harry's wife chose to wear a blue striped shirt and cream high-waisted pants by Ralph Lauren and a bag by Alturzarra.
Taking another small break from her maternity leave, Kate wore a breezy white dress with polka-dots by Jenny Packham.
It was their first engagement together without Princes Harry and William and the duo were clearly having a lot of fun.More news: Russian Officers Indicted for Hacking Clinton Campaign, DNC, DCCC
Tiger Woods, Lewis Hamilton and Anna Wintour were in Serena Williams' box for championship day, giving the seven-time Wimbledon champ an A-list cheering squad. Markle wore a blue-and-white striped Ralph Lauren shirt and cream-colored trousers, while Middleton wore a white pattered dress, notes Entertainment Tonight.
"I had a really tough delivery and multiple surgeries and nearly didn't make it, to be honest".More news: Shocking mugshot shows unshaven Paul Manafort as he's moved to different jail
Williams, who gave birth 10 months ago, is the first mother to reach the last round of the tournament since Australian Evonne Goolagong in 1980.
USA Serena Williams will take on Germany's Angelique Kerber in the ladies finals today.
She said: 'Every year for a couple years she comes out to Wimbledon, has supported me...More news: United States tries to bully World Health Organization into dropping breast-feeding resolution
But this year she is attending in a different seat, with a different title but with the same friendly support.