Federline has experience in the fatherhood department: He's dad to daughter Kori, 3, and son Kaleb, 18 months (left, in Orange County, Calif.), with ex-girlfriend Shar Jackson. Is he ready for more kids with Spears? "We're going to wait," he told Ryan Seacrest recently. "(We have our) careers and first baby. You've gotta spoil the first one."