Jimmy Fallon and Winnie (INFDaily.com)
And on Friday, he revealed another secret during a pre-taped interview on the "Today" show.
"My wife and I had been trying for a while to have a baby," Fallon told "Today" anchor Savannah Guthrie. "We tried a bunch of things – so we had a surrogate."
The comedian, who’s set to take over "Tonight Show" from Jay Leno next spring, said he and Juvonen decided to keep their impending new addition a secret.
"We said, 'We're not going to tell anybody.' It'd be more fun if it's just private between me and my wife. And then we get to introduce her to everybody."
The introduction came just a day after the royal baby, Prince George, was born – not that Winnie has been hurting for attention.
"I can't stop looking at her," Fallon gushed on "Today"'s plaza Friday morning. "When I'm not holding her, I'm looking at photos of her on my phone. She's the coolest – the best thing to ever happen to me."
It's not just her dad’s heart she's managed to claim.
"She's our royal baby around here," Natalie Morales said, with Al Roker adding, "Princess Winnie."
Fallon said he and his wife worried about how to share their secret baby news with family and friends.
"When it happened, we were in shock. We were like 'Who do we tell? Who's gonna be mad at us if this gets out?' We had to call everybody and it's so emotional!"
Fallon’s full interview will air on "Today" next week.
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