Serena Williams threw a retro-themed baby shower celebration, because she's just that cool. The world-renowned tennis player, who announced her pregnancy with fiancé Alexis Ohanian earlier this year, partied like it was the 1950s with her sister Venus and her best girl pals Kelly Rowland, Ciara, Lala Anthony, Eva Longoria, and Angie Beyince. Serena also gave a tiny glimpse of her growing baby bump while rocking a black long-sleeved crop top and a yellow A-line skirt. The Wimbledon champion finished her '50s-inspired look with a red kerchief and white pearls. Check out all the best photos from the adorable day ahead!