Credit: Jason Merritt/FilmMagic

Taylor Hanson's got a brand-new project in the works: His fifth child!

The middle Hanson brother -- who is currently touring internationally with his siblings Isaac and Zac -- will soon welcome a new baby, his rep confirms to Us Weekly.

He and wife Natalie's new arrival will join siblings Ezra, 9 1/2; Penelope, 6; River, 5 1/2; and Viggo, 3.

"I know for my wife and I, we always loved the idea of being young parents," he told in 2011. "It is an incredibly inspiring and challenging job being a parent, and as it turns out, being young really helps you keep up."

The musician, 29, and his wife, 28, married in 2002.