She posted a shot from the tennis player's Vogue shoot in which the then-expectant star was rocking a gorgeous cream gown. Bey wrote "Congratulations Serena!" over the image.
Aww! Clearly, this baby -- whose name has yet to be revealed -- already has a bevy of famous loved ones.
The baby girl's aunt Venus Williams also expressed her elation: "I'm super excited," the tennis pro told ESPN yesterday after she won her third-round matchagainst Greece’s Maria Sakkari. "Words can't describe."
Congratulations again to Serena and her fiance Alexis Ohanian on their beautiful new family of three!