Credit: Jeff Vespa/WireImage.com

Nick Cannon is still playing coy on wife Mariah Carey's pregnancy. Asked if she's expecting, he told UsMagazine.com Wednesday at the America's Got Talent finale in L.A.: "Who knows?"

So she might be?

"You never know!" he teased.

He told Us he is excited about being a dad "one day."

And he has no doubt Carey, 41, is ready.

"She will make an outstanding mother!" he said.

Now that his Talent hosting duties are over, he said it "will be really nice to spend more time together."

Any vacation plans?

Said Cannon, 29, "I don’t even know what that is!"