Tennis great Serena Williams can still serve up entertainment – and now she’s doing it at home.

The 23-time Grand Slam singles champion shared a video this week of her telling daughter Olympia that she’s pregnant.

The five-year-old, whom Williams was carrying when she won the Australian Open in 2017, had been worrying about Serena’s weight gain, the athlete explains in the video.

“Remember how you’ve been praying/planning for a little sister or brother?” Williams says to her daughter. “Well, we went to the doctor, and it turns out I’m not getting fat, but I have a baby in my belly.”

“Are you kidding me?” Olympia replies.

“You’re gonna be a big sister,” confirms Alexis Ohanian, Williams’ husband and Olympia’s father.

Olympia shrieks and hugs her mum.

“Oh, my god! I’m so excited!” she says.

She screams again as she sprints out of the room ― where she apparently falls.

“I’m OK!” Olympia yells off-camera.

Williams, 41, has ostensibly been retired since last year’s U.S. Open, and one of the reasons she cited was to grow her family.

But the new video shows the funny exchange in full: