Underneath, Williams went secretly casual, rocking sneakers with her look. She showed off her kicks in an Instagram video, writing, “Little known fact: I often wear sneakers under my evening gown. These @maisonvalentino @pppiccioli gave to me last min. I told him to be careful I tend to be comfy for long nights #beingserena.”
Williams and Ohanian were just a few of the A-list celebrities to attend the royal wedding. Other stars included George and Amal Clooney, Oprah Winfrey, Priyanka Chopra, and several members of the cast of Suits. For more from Harry and Meghan's big day, watch the clip below!