"Welcome, Adira River Ohanian. I'm grateful to report our house is teaming with love: a happy & healthy newborn girl and happy & healthy mama," Ohanian wrote alongside multiple sweet snaps of the family — which also includes the couple's daughter Olympia, 5 — bonding with their latest addition.
"Feeling grateful. @serenawilliams you've now given me another incomparable gift — you're the GMOAT. Thanks to all the amazing medical staff who took care of my wife & our daughter 🙏 I'll never forget the moment I introduced @olympiaohanian to her baby sister," the venture capitalist penned, also adding a moving quote that read, "Your peace would have been like a river, your well-being like the waves of the sea."
The pair also gave fans insight into their firstborn warming up to her little sister via a heartwarming TikTok. In the clip, captioned "Welcome my beautiful angel," Olympia leaned down to give a bundled-up Adira a sweet kiss.
The tennis champion announced her second pregnancy while walking the red carpet of the 2023 Met Gala. "Was so excited when Anna Wintour invited the 3 of us to the Met Gala," Williams captioned a snap of herself and her husband — whom she wed in 2017 — posing with her burgeoning baby bump in a black Gucci gown.
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Williams and Ohanian previously discussed when they told their eldest about their family expanding. "Olympia does not know right now that I am pregnant, so the big reveal will be at the Met and then before we leave, I'll tell Olympia," the happy mama said in an Instagram video. "The reason I haven't told her is because she can't keep a secret!"
"Remember how you've been praying for a little sister or brother? Well, we went to the doctor and it turns out I'm not getting fat. But I have a baby in my belly," the athlete told Olympia, who excitedly asked, "Are you kidding me?!"