The 45-year-old actor has daughters Sienna-Marie, five and Shea, three with wife Steffiana de la Cruz. He admitted his wife was expecting after she was seen sporting a suspected baby bump at the premiere of his latest movie, The Dilemma in Chicago last week.
Speaking on The Today Show in the US, Kevin said there was a baby "on the way".
Discussing fatherhood in the past, the comedy star said he had become less uptight about his family following the birth of his second child.
He said: "You kinda loosen up with the second child a little bit, which is nice.
"The first child, I remember they just give it to you at the hospital, you're supposed to put her in the car seat and drive home. I was 10-2 on the wheel in the right lane 30 miles an hour on the highway with the flashers going. Second kid, I had the top down. I was steering with my knees."