Alexis Jr., most commonly referred to as Olympia, is the couple's first and only child together. She was born on September 1, 2017, and quickly became the center of both Serena and Alexis's lives. In fact, Serena told POPSUGAR that she plans on never leaving her daughter's side for even a day if she can help it. "Yeah, absolutely, I feel great [about spending time away from her]. I feel like when she's 18, at college, it'll be hard for me, but I'll manage. Hopefully she'll have a brother or a sister and they'll still be around." She added, laughing: "I'm so serious."