Zach Galifianakis, Jimmy Fallon: 'Birdman' Star Reveals Gender Of His Baby On 'Tonight Show' [VIDEO]

Funny man Zach Galifianakis has kept the birth of his first born completely under the radar. It's been an entire year since the birth and the public hardly knows a thing. But now the actor has finally revealed that he is the proud parent of a baby boy! The Birdman star revealed on Monday night's Tonight Show Starring Jimmy Fallon that he and his wife Quinn Lundberg are indeed proud parent to a one-year-old boy.

"We have a boy!" the actor said. "I think fatherhood is just the greatest thing. It really really is."

Fallon and Galifianakis bantered back and forth, jokingly. "We don't want to find out until it's 16," joked Galifianakis before he revealed to the host and audience the sex. "We just call it 'It' right now. No, we haven't named it yet. It has a number right now."

Fallon, playing along asking, "Can you tell us the number?"

"One," the Hangover actor teased.

Galifianakis married co-founder of the Growing Voices charity in August 2012 and in September 2013 the happy couple gave birth to their first child.

Fallon asks Galifianakis what type of father he is and the actor responds with a hilarious answer, "He's young so I bathe with him in the tub...it's cute," laughed the actor. "I realized when we were bathing once, his testicles fit perfectly in my belly button."

The crowd laughed and the actor seemingly kept a straight face. He goes on to joke. "And I'm not a particularly religious person, but when I saw that, I was like, 'Oh, there's a God.' It all makes sense now. It's by design."

On a different subject, the two chat about how the Between Two Ferns host was a former nanny. "Yes, I was a nanny. The kids were older...seven and nine. So I have a little experience with child care."

Fallon asked what if there was anything that he learned from being a nanny that he now uses in his own parenting.

"Discipline is very, very important," he said. "Kids crave discipline. So, you know, prenatal spanking is important."