Serena Williams reveals she is 5 months pregnant in bathing suit snap

"Serena Williams will have a new pride & joy to hug and call her own soon! Congratulations on the exciting baby announcement!" the post read.

The tennis star shared the photo on the same day her biggest rival, Maria Sharapova, celebrated her 30th birthday.

Williams, 35, is engaged to Reddit co-founder Alexis Ohanian, 33. The US Open champion documented her whirlwind engagement on Reddit back in December with a poem.

Ohanian popped the question during an impromptu trip to Italy. He proposed at a restaurant in Rome at the same table where the duo first met on a lunch outing in 2015.