Walter was besotted with the Duchess of Sussex and reached out to touch her hair several times as they joked around together. Picture; Gerry Mooney The Duke and Duchess of Sussex, Prince Harry and Meghan Markle pictured as they arriver for a visit to Epic at the CHQ building.
It will mark the pair's first official engagement together without their husbands.
It will be a particularly special day out for Meghan, as she's known to be good friends with Serena, 36, who was among the guests invited to the royal wedding in May.
After giving birth to her daughter, Olympia, on September 1, Williams dealt with health complications that included blood clots and led to what she said were multiple operations.
Told that Kensington Palace had announced the Duchess would be there, Serena smiled and said: "There you go".
"I couldn't be more proud of those two, I think they'll do a fabulous job".
We're sure there will be another little royal on the way in the near future, but for now it looks like they're just enjoying their new life as husband and wife.
Kate, who is patron of the All England Lawn Tennis and Croquet Club and is a longstanding fan of Wimbledon, will also pay a visit to SW19 on Sunday when she will watch the Gentlemen's Singles Final along with the Duke of Cambridge.
He explained: "I look forward to coming to London to meet them soon".
Serena will play against Angelique Kerber in the final.
She told BBC Sport: "It's insane, I don't even know how to feel". Sources claim that Middleton has stopped giving Markle advice on how to handle herself in public because she believes the actress is trying to outperform her.