The tennis champ took to Snapchat to reveal the happy news, posting a photo of her growing bump alongside the caption ’20 weeks’.
Back in December, Serena revealed that she is engaged to Reddit co-founder Alexis Ohanian, with the tycoon proposing to Serena in the same Rome restaurant where they first met.
In a fitting tribute to her beau, Serena revealed the exciting news over on her Reddit account, posting a poem that read: “I came home. A little late. Someone had a bag packed for me. And a carriage waited.
“Destination: Rome. To escort me to my very own ‘charming.’ Back to where our stars first collided. And now it was full circle.
“At the same table we first met by chance. But by choice. Down on knee. He said 4 words. And I said yes.”
The pair have kept their relationship incredibly private after meeting eachother just over a year ago, with it thought that they first crossed paths at a luncheon.
The 35-year-old star has previously dated the likes of Drake and Grigor Dimitrov, and recently admitted that she wants children.