According to TMZ, Williams was "admitted to St. Mary's Medical Center in Palm Beach, Florida on Wednesday and was induced on Thursday."
ESPN got Venus William's reaction to the birth, just before her match at the U.S. Open. "You know obviously I'm super excited. Words can't describe," she said.
Williams announced her pregnancy in April with a picture on Snapchat captioned "20 weeks." Her revelation cast new light on her seventh victory at the Australian Open in January, which she won while two months pregnant. Serena's coach Patrick Mouratoglou believes that she will start training again in November.
In December she and Reddit co-founder Alexis Ohanian got engaged.
Update, 1/09/17, 5:37 p.m: Beyoncé has congratulated Serena Willians with an Instagram post. Williams starred in Beyoncé 's video for "Sorry."