The tennis champ, who shot an impromptu Snapchat video with the royal when they met at Wimbledon in July, told PEOPLE how the rare royal moment went down.
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“When I saw her, I wanted to take a picture with her,” says Williams, who is one of PEOPLE’s 25 Women Changing the World. “But then I was like, ‘Should I do a picture or a Snapchat video?’ Obviously, I opted to do that and it was fun!”
And Williams couldn’t pass up the chance to ask Kate all about her world-famous sapphire and diamond engagement ring — much to the royal’s shock.
“She was surprised that I asked her about her ring and she was like, ‘You know?’ And I’m like, ‘Everyone in America knows about your ring!’ She was like, ‘Wow.’ ”
The royal tennis fan now has a major fan in Williams.
“She was super sweet, super level, so beautiful — she was really nice,” Williams says.