The 41-year-old actor and wife Fergie welcomed a son named Axl Jack at Cedars-Sinai Hospital in August 2013, reported Digital Spy.
"It's not about us anymore; it's about all of us: me, Ferg, and the baby. We look at ourselves now and we look at our lives before, and it's like, 'Wow, we actually have a family now - this is like a real family'!," he said.
Duhamel said that parenting is one of the sweet experiences of life.
"Getting to see all of those cliches that you hear about from other parents: that it's hard, it's crazy, it's the funniest and most fun thing you'll do.