How they kept it a secret, we don't know, but now that his daughter has arrived, Jimmy Fallon couldn't help but gush on last night's Late Night with Jimmy Fallon.
How adorable is he? Almost as adorable as the name Winnie Rose Fallon.
Something tells me Winnie Rose and Fallon's dog Gary are going to be great pals. "Winnie and Gary" sounds like a Disney channel show just waiting to happen.