The 23-time Grand Slam winner had to withdraw from her Rogers Cup match due to a back injury.
The athlete tweeted she was "SPEECHLESS" after meeting the former first lady.
The Duke and Duchess of Cambridge attended the men's final on Sunday.
The Serbian tennis player is the first man since 1948 to save championship points in the final and go on to win.
The charismatic bird acts as a non-lethal agent to keep pigeons from roosting at the All England Club.
The tennis star said her royal friend is also happy for Simona Halep for her first Wimbledon win. "That’s just the kind of person that she is,” Williams said.
The royal sisters-in-law watched Simona Halep defeat Serena Willams in the women's singles final.
The Romanian Halep beat Williams 6-2 at the All England Club.
The survey polled people living in Britain. Chrissy Teigen said she would "cry of laughter" watching the responders play against the tennis superstar.
The tennis legend told reporters she wasn't sure how she caused any damage, saying, “Maybe I’m super strong, I don’t know.”
The tennis superstar reflects on her controversial U.S. Open match against Osaka in a candid, powerful essay.
The 5-year-old royal also has another connection to Serena Williams.
The Swiss tennis champ is currently competing at Wimbledon.
The Duchess of Sussex and the tennis legend have been friends for nearly a decade.
The tennis great's dress and "Broosh" was designed by Nike and Swarovski.
At only 15, Cori "Coco" Gauff took on the five-time Wimbledon champion in a historic match.
The 17-year-old stunned defending champ Simona Halep to blaze into the semifinals.