Tennis star Serena Williams and fiance Alexis Ohanian welcomed their first child today, Williams, 35, giving birth to a baby girl in Palm Beach, Florida on Sept. 1.

Williams accidentally announced her pregnancy on Snapchat April 19, when she inadvertently posted a selfie that showed off her baby bump with the caption "20 weeks." Serena told Gayle King at a TED conference in Vancouver days later, "On social media you press the wrong button and … 30 minutes later, I missed 4 calls and I’m like, 'That’s weird."

Then Williams and her Reddit co-founder beau also have plans to tie the knot -- they were engaged last December but have yet to set a wedding date. Congrats to the happy couple!