Erin Hill
November 03, 2016 02:28 PM
Serena Williams and Princess Kate

The next best thing to Princess Kate actually being on Snapchat? Seeing her show up in a video alongside Serena Williams.

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.

Chris Jackson/Getty
Chris Jackson/Getty

“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.

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