Serena Williams' representative has confirmed the tennis ace is due to give birth in the autumn.
Serena's spokeswoman, Kelly Bush Novak, said: “I’m happy to confirm that Serena is expecting a baby this fall."
She added that Serena won't be playing again in 2017, but is looking forward to playing again the following year.
Earlier in the day the 35-year-old showed off her growing baby bump in a bright yellow bathing suit on Snapchat.
Serena suggested she is well into her second trimester as she captioned the post "20 weeks".
The happy news comes just a few months after she got engaged to Alexis Ohanian.
The sporting icon announced she and the Reddit co-founder were to tie the knot after just over a year of dating with a poem posted on her verified Reddit account.
She wrote: "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."
Serena previously revealed she wants to have children "someday" but still feels like she is too young.
She explained: "I definitely want to have kids one day. That's something I've always wanted since as long as I could remember. And the older I get, the more I'm like, 'I'm too young!'"
The American is currently ranked No.2 in the world.
She won the Australian Open in January and is widely considered to be the greatest woman to play the game.
Serena hasn't appeared on court since defeating her sister Venus in the Australian Open final in January, as she has pulled out of a number of tournaments this year.