Federline reveals the unborn tot is a girl and they have already picked out a name.
He tells Us Weekly magazine, "(Prince) said that if we were going to have a little girl, she wanted to name her Jordan. And then, we actually thought that it was a boy, but we stuck with the name Jordan because, you know, it fits both ways."
"We just found out the other day that we're having a girl. So it worked out!"
The baby will be a little sister to Federline's two sons with Spears; he also has a son and a daughter with ex-girlfriend, actress Shar Jackson.
The child will be Prince's first.