Duhamel said they are not afraid to enjoy time together over some tasty fast food, reported E!Online.
"Yes, we do still go to Taco Bell. We're very glamorous," he said.
While both have found success in their respective industries - Fergie in music and Duhamel, 42, in acting - the new father father admits he is still the same guy before all this attention came around.
"I don't really take fame that seriously, to be honest. I don't feel it's that real. There are some great benefits to it, but at the end of the day, I'm truly no different than I was when I got into this business," he added.