"Congratulations to my beautiful and very tough wife @mollymcnearney on delivering our baby girl this morning," the late-night comedian tweeted at around 10:30 a.m. PT. In a second tweet a few minutes later, he added, "Thanks for all your kind baby wishes -- turns out, not ALL tweets are mean!"
McNearney, for her part, wrote, "Kids, don't do drugs. Until you have a baby. Then do ALL OF THEM."
This is Kimmel's first child with McNearney, and his third overall. He's also dad to son Kevin and daughter Katherine -- both in their twenties -- from his first marriage to Gina Maddy.
The "Jimmy Kimmel Live!" host initially revealed McNearney's pregnancy during an appearance on "The Ellen DeGeneres Show" back in February. "It's funny, because I was just with some friends who had a baby. I was like, 'Oh, yeah.' There's new ways to do things," he said at the time.
Then, joking about his baby name picks, he quipped, "Karate or The Riddler are the names we're thinking of right now...And I would like the baby's middle name to be Effin. And not the curse version of it, like e-f-f-i-n. Like Ellen Effin DeGeneres. I mean, what a great name, right?"
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