it's a girl!

Serena Williams, Alexis Ohanian welcome baby girl

Neilson Barnard/Getty Images

On Friday, tennis superstar Serena Williams welcomed a baby girl with her fiancé, Reddit co-founder Alexis Ohanian, the New York Daily News reports. "Mom and baby doing well," shared Chris Shepherd, a news producer for ABC affiliate WPBF-25, on Twitter.

Williams has shared photos and stories of her pregnancy on her social media accounts, although she accidentally announced her pregnancy in April on Snapchat by captioning a photo "20 weeks."

Just a few days after announcing I was pregnant, we did this shoot for the @voguemagazine iconic September issue. I was so energetic that day but then I remember being totally exhausted and needed to take a break for an hour. I was still trying to understand this whole pregnancy process. Nowadays I have no ankles or toes and my fingers resemble sausages but it's moments like this that are captured by @mariotestino that makes everything worthwhile. Dress by my love @donatella_versace

A post shared by Serena Williams (@serenawilliams) on Aug 16, 2017 at 6:07am PDT

Williams, 35, beat her sister Venus Williams to win the Australian Open — and her 23rd Grand Slam title — in January, when she was several weeks pregnant. She hopes to return for the next Australian Open in January. "[Williams is] very good at a lot of things and well on her way to being an awesome mom too," Ohanian said in July.