While Serena Williams cheered on her sister, Venus, at the French Open, we checked out Serena's maternity outfit. The mom-to-be stood out on the sidelines by wearing a bright Zara floral kimono. The summery outerwear featured an open v-neckline and sash, which tied snugly over her growing baby bump. Though the star wore her kimono over a black dress, we can easily imagine it styled with a white crop top and jeans. The exact Zara piece is currently sold out, but we found some similar versions below to shop.