"Serena and Alexis have spared no expense on their dream wedding".
The victor of 23 Grand Slam singles titles, Williams has been engaged to Ohanian, 34, since December.
The exact venue has been kept so secreat that even the guests won't know the exact location until Thursday morning.
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The event is said to be costing more than $1 million to stage and is being organized by celebrity wedding planner Preston Bailey.
Serena and Alexis chose the Contemporary Arts Center because of its incredible architecture and history. She and Ohanian are parents to Alexis Olympia, who was born September 1.
It's also understood that guests on the day will be banned from posting anything on social media, as Serena is believed to have signed a deal with Vogue magazine to publish exclusive pictures of the big day.
In other news, Serena Williams recently complained that her fiancé spends a little bit too much money on toys for their baby. They share photos of Olympia on Instagram all the time, and she's absolutely adorable.
Williams announced the news of their engagement with a poem on her soon-to-be husband's platform, Reddit.
She said: 'I used to think I'd want to retire when I have kids, but no.