Serena Williams explains why sister Venus would refer to her baby-to-be as a "she" in a recent interview. During her post-match interview with Eurosport after winning the second round of the French Open on Wednesday, Venus seemed to have accidentally revealed that Serena was expecting a girl. "She's going to call me 'favorite aunt,'" the 36-year-old tennis pro said. "Every day we're like, 'Baby Vee, baby Isher, baby Lyn,' so we all want the baby to be named after us."