Serena Williams is a mom! The powerhouse tennis pro [1] gave birth to a baby girl at St. Mary's Medical Center [2] in West Palm Beach, FL, a source confirmed to Us Weekly on Friday. It's the first child for Serena and her fiancé, Reddit cofounder Alexis Ohanian [3], who got engaged in December 2016. In a recent interview, Alexis told Jimmy Kimmel [4] that the pair were not planning to find out the baby's sex until it arrived, though Serena was convinced they were having a girl because "only a woman could be strong enough" to handle winning the Australian Open in utero.

Serena (accidentally) revealed her pregnancy via Snapchat in April [5]. In July, she posed nude for the cover of Vanity Fair [6], and she threw a star-studded, retro-themed baby shower [7] in early August that brought out celebrity pals Ciara, Kelly Rowland [8], and Eva Longoria [9]. On the day Serena's baby girl was born, she got a sweet Instagram shout-out from pal Beyoncé [10], who welcomed her own twin babies in June.

Congrats to Serena and Alexis on their growing family!