Late night TV host Jimmy Kimmel and his wife, Molly McNearney, welcomed their first child together Thursday. The baby girl's birth was announced via Kimmel's Twitter.

"Congratulations to my beautiful and very tough wife @mollymcnearney for delivering our baby girl this morning," he wrote around 10:30 a.m. Pacific Time.

On her twitter, McNearney wrote, "Kids, don't do drugs. Until you have a baby. Then do ALL OF THEM."

While the baby's name has not been announced, the "Jimmy Kimmel Live" star did reveal the pregnancy while appearing on "The Ellen DeGeneres Show" in February.

"Karate or The Riddler are the names we're thinking of right now," Kimmel said on the show. "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?"

This is the couple's first child together, Kimmel's third overall. Both of his other children, Kevin and Katherine, are in their twenties, from his first marriage to Gina Maddy. Kimmel, 46, and McNearney married July 2013.

Kimmel joked about the large age gap between his children while on "Ellen."

"It's funny, because I was just with some friends who had a baby," Kimmel said. "I was like, 'Oh, yeah. There's new ways to do things.'"

McNearney has been a head writer for Kimmel's late-night show since 2008 and wrote the 64th Primetime Emmy Awards that Kimmel hosted.

According to an interview with Glamour magazine in February, McNearney confessed the workplace relationship began in 2010 when they were writing together for his show.

"All the writers would socialize after the show, and we would just hang out more and more," she said. "We really liked each other as friends, and then it just kind of turned. He cooked for me, and that was it. It sealed the deal."