The little one is also the firstborn for Mom, Briana Jungwirth. The couple's new son arrived this week in Los Angeles, a source confirms to People.
The news that the two were expecting a baby was confirmed last summer, and Tomlinson even expressed his excitement on Good Morning America. The boy band member exclaimed, "Thank you, yeah, obviously it's a very exciting time, so I'm buzzing, thank you."
Well, now the new dad has even more to buzz about as he walks down the road of fatherhood. He'll definitely have plenty of help with the new arrival, as his bandmates have always shown their support.
Here's to the newborn!