The 32-year-old actor, who plays a tattooed bad boy in his new film, said the emotions he shows on screen were all real because he grew so attached to the tiny tot playing his son, reported Contactmusic.
"I didn't know that was going to happen. I was just sitting in the church watching a baby be baptised, and I don't know why I was emotional, but I was.
"First of all, that's due to the face that the kid who plays my son is an infant - his name is Tony Pizza. It's hard not to like a guy named Tony Pizza. We really hit it off," he said.
"There are always stories behind them, but they are constantly evolving. You regret why you got them, so you change the meaning," he added.