Williams reportedly stole the show when it came to beer pong, a drinking game popular with American university students where players throw table tennis balls into cups filled with beer.
"Serena Williams played beer pong like it was tennis," a reception attendee reportedly told The Sun.
You could say it was game, set, and match to Williams, who seemingly came prepared for the event as she wore trainers under her Valentino gown.
She posted an Instagram video stating: "Little known fact: I often wear sneakers under my evening gown."
Williams was accompanied by her husband, Reddit co-founder Alexis Ohanian, and was invited to the royal wedding because of her association with Markle.
Williams met Markle in 2014 when they teamed up for a flag football match at a Celebrity Beach Bow event organised by DIRECTV.
Little known fact: I often wear sneakers under my evening gown. These @maisonvalentino @pppiccioli gave to me last min. I told him be careful I tend to be comfy for long nights #beingserena pic.twitter.com/JRZAOrJvjI— Serena Williams (@serenawilliams) May 20, 2018
SHARE THIS STORY USING ANY OF THE BUTTON BELOW ⬇ PLACE YOUR TEXT ADVERT BELOW ⬇⬇⬇