Tennis superstar came to baby Archie in Frogmore Cottage last week and made a flying visit before he went to Paris to compete in the French Open.
Mrs. Williams, 37, was accompanied by her husband Alexis Ohanian, 36, and their one-year-old daughter Olympia.
The seven-time Wimbledon champion placed a picture of herself in a royal state room in the Windsor house of Harry and Meghan, with whom she is good friends.
Mrs. Williams was a guest at Meghan’s wedding with Prince Harry and reportedly co-hosted her £ 330,000 baby shower in New York in February.
The tennis star was assisted with her hosting assignments for the flashy event by Meghan’s best friend, Canadian fashion stylist Jessica Mulroney, 39, and the duchess’s student student club sister, Genevieve Hillis.
The event took place in The Mark’s incredible Grand Penthouse suite, which costs as much as $ 75,000 per night, making it the most expensive hotel room in the US.
Star guests were Amal Clooney, American CBS Anchor Gayle King and actress Abigail Spencer.
Mrs. Williams and Meghan met for the first time at a Super Bowl party in 2010 and have remained friends ever since.
Meghan wrote about their first meeting on her now closed blog The Tig and said: “We both took pictures, laughed at the flag football game and didn’t chat about tennis or acting, but about old-fashioned girlish stuff.”
The duchess also described how the couple “hit it right away” and Meghan was introduced at Wimbledon in 2017 to see how the star participated.
Meghan, 38 and Harry, 34, have been inundated with visitors at Frogmore Cottage in the last seven days, trying to determine who Archie’s godparents will be.
Favorite for the role of godmother is Meghan’s best friend, Canadian fashion stylist Jessica Mulroney, 39, who saw the royal parents and their baby from Canada with daughter Ivy, five years old.
Top contender for the role of godfather is Soho House creative director Markus Anderson, 42, who has also been to visit.
He has been described as the “second most important man in Meghan’s life” and arranged her baby shower in April.
Harry’s aunts, Lady Sarah McCorquodale and Lady Jane Fellowes – the sisters of Princess Diana – have visited, and so have some of his old friends.
The most striking was Tom Inskip, who allegedly had a cooling off of his friendship with Harry after he told him to slow it down with Meghan. He visited Lara with his wife.
Another visitor was Mark Dyer, 53, who has been close to Harry since his appointment to his equerry shortly after Diana’s death.
Dyer can earn a little praise for bringing Harry and Meghan together – he owned three pubs in West London where they quietly enjoyed their first dates.
Meghan’s mother, Doria, left Frogmore Cottage last Monday after two weeks to help her with the baby.