It's good to be a duchess!
"We've always had a wonderful friendship", Williams said of her friendship with Meghan, the Duchess of Sussex, earlier this week.
Kate was wearing a Jenny Packham dress with nude suede heels, and matching handbag.
The men's singles semi-final between Rafael Nadal and Novak Djokovic will resume at 1pm tomorrow on Centre Court under the roof.
Every year, for a couple years, she comes out to Wimbledon, and has supported me.
The Duchess of Cambridge (Kate) and the Duchess of Sussex (Meghan) made their first joint public appearance together at the famed tennis tournament on Saturday.
Meanwhile, Williams makes a triumphant comeback to the London tournament, giving birth and battling subsequent health complications just ten months ago, Fox Sports reports.
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Janine Puhak is an editor for Fox News Lifestyle.
Other notable faces in the royal box included Lewis Hamilton and Vogue editor Anna Wintour.
This is not the first time Meghan, who is friends with Serena, attended the tennis championships.
Also watching from the Royal Box on Saturday were actresses Emma Watson and Thandie Newton, and actor Sir Mark Rylance.
Kerber defeated Williams 6-3, 6-3, clinching her first-ever Wimbledon win.
"It's insane. I don't even know how to feel, you know, because literally, I didn't expect to do this well in my fourth tournament back", Williams said according to ESPN.
Kate, 33, will also attend the gentleman's singles final on Sunday alongside Prince William.
"I'm sure you will have your next grand slam title".