It's a girl! Naomi Osaka reveals baby's gender in springtime snapshot

WATCH: Tennis Channel Live discussed Naomi Osaka's pregnancy earlier this year.

With a simple social media post on Friday, Naomi Osaka finally answered one of tennis' biggest questions of the last few months: Boy or girl? The four-time Grand Slam champion and former world No. 1 is about to be the WTA's latest girl mom.

Two weeks after dropping her latest clothing collection in collaboration with Nike, Osaka's latest social media update was much more personal, as she shared photos from what appeared to be a baby shower held in her honor.

Fans didn't have to look long to deduce the gender of Osaka's upcoming addition: The first photo in her Instagram carousel, and the one she chose to post to Twitter, featured Osaka standing in front of a display of pink and purple balloons, complete with a chyron announcing the impending arrival of "a little princess."

Osaka will join players including Kim Clijsters, Serena Williams, Mandy Minella, Tatjana Maria, Vera Zvonareva and Patricia Maria Tig in returning to tour after giving birth to daughters.

In March, Osaka told People magazine that she knew the baby's gender already, but that she was keeping it a secret at the time from her longtime beau, rapper Cordae, the baby's father. But as of Friday, it was clear that it was a secret no more: The last of the snapshots in Osaka's Instagram post was a sweet candid of the dad-to-be, whose full name is Cordae Amari Dunston, kissing her baby bump.

Osaka has largely kept a low profile on social media, at least in terms of personal posts, since announcing her pregnancy in January, but she first showed off her blossoming bump for the first time in a series of photos from a trip to Japan back in March. But earlier this month, she opened up about her impending motherhood to TODAY, where she touched on just when he found out he'd be a girl dad.

“He knows the sex now—it was only a secret until we did the reveal party with our closest family and friends a couple months ago,” Osaka said. “It was hard to keep it a secret, but I also knew it would be much more fun to surprise him and everyone else during the party, so it was worth the wait.”

In the interview, Osaka also further reinforced her desire to return to tennis in 2024 and her excitement about a future in which her child can watch her compete for major titles, which was a cornerstone of her initial announcement.

"I think that moment will be surreal and I really look forward to the day that it actually happens," she said. "It really does feel like a dream to think of my own child in the stands watching me, and I’m so excited that I’ve got that coming in the not-so-distant future."