PARIS (AP) ? Serena Williams wants everyone to slow down with all of that "It's a girl!" talk prompted by her sister Venus. The pregnant tennis star sent out a tweet on Thursday to "clarify what Venus said" after the older sibling appeared to accidentally let something slip during a TV interview with Eurosport at the French Open by blurting out about the baby, "She's going to call me 'Favorite Aunt.'" But a day later, Serena wrote: "I think the surprise of knowing what you are going to have on that very special day you give birth is prob the best surprise you can ever have."