An official statement had not been released at the time of publishing this article, but international media have quoted sources confirming the athlete gave birth at the St. Mary's Medical Center in 

Tennis champ Serena Williams has given birth. She and her fiancé, Alexis Ohanian, welcomed their baby girl into the world on Friday, September 1.
An official statement had not been released at the time of publishing this article, but international media have quoted sources confirming the athlete gave birth at the St. Mary's Medical Center in West Palm Beach, Florida.
Congratulatory messages have already been flooding in, including from some of her well-known pals like Beyoncé.
And, of course, the internet is ecstatic.