Venus Williams accidentally confirms sister Serena is having a girl!

The cat is out of the bag!

During an interview on Wednesday, Venus Williams seemed to have accidentally reveal the gender of her sister's baby -- a girl!

"What is the baby going to call you?" the interviewer asked Venus.

"She's going to call me 'favorite aunt,'" the 36-year-old tennis star said. "We're all like, 'Baby V, baby Lyn, baby Isha.' We all want the baby to be named after us."

With Auntie Venus and her own superstar mom, Serena's daughter sure has a lot to live up to!

Serena and her fiancé, Reddit cofounder Alexis Ohanian, are expecting their first child together. The two got engaged in December 2016, and they announced the news on where else?! Reddit!

And if you recall, Serena also revealed a couple of weeks ago that she accidentally announced her own pregnancy to the world.

"I was on vacation, taking time for myself, and I have this thing where I've been checking my status and taking a picture every week," the soon-to-be mom said. "I've been just saving it, but you know how social media is -- you press the wrong button and ... My phone doesn't ring that much, and thirty minutes later, I'd missed four calls. So I picked it up and realized, 'Oh no.'"

Since then, Serena has been fabulously flaunting her baby bump. She has recently been spotted in Monaco celebrating the impending arrival of her first child, in what has become known in the celeb world as a "babymoon."

And before that, Serena also celebrated her upcoming nuptials in Miami with a "magical" bridal shower weekend with the closest women in her life.

While the tennis superstar hasn't had her baby shower yet, we're sure close pal Beyoncé gave her some tips. Williams was one of the many in attendance at the star-studded event.

Yup, it's safe to say Serena is living her best life right now!