The tennis-pro gave birth to a 6lb 13oz baby girl on Friday September 1 in a hospital in Florida, it has been reported.
There was no immediate confirmation of the birth from Williams' representatives. The delivery was also confirmed by Serena's coach Patrick Mouratyoglou, via Twitter. Recover well & enjoy without limitation'.
But though she's excited about their bundle of joy, Williams also previously admitted that she has never been around babies.
The Tennis star has not competed since winning the Australian Open in January but has posted several videos to social media showing her hitting balls during her pregnancy, according to Channel NewsAsia.
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"I want to baby to be healthy and for that you need a healthy life".
The princess was conscious and had her eyes open when she was pulled out of the wrecked Mercedes, Gourmelon told the Sun. "I was on vacation just taking some time for myself and I have this thing where I've been checking my status and taking pictures every week to see how far along I'm going".
"I knew it was coming".
"We have a lot of work ahead of us", he added, playfully referring to her eagerness to get back on the court. Nike called Williams the "greatest athlete ever" after this win and honored her in an ad.
"Two weeks after we found out (about the pregnancy), I played the Australian Open. Ride or die. Women are tough that way", Williams told the magazine. The couple met in Rome in 2015.