The couple were blessed with fraternal twins on April 30, 2011, the couple's third wedding anniversary, reported Us magazine.
"The kids run the house. We just running and chasing after them. My wife is being the diva that she is. I'm trying to keep up with them.
"We all do it (change the diapers) but for some reason, I get that duty a little bit more, We all do it but for some reason, I get that duty a little bit more," he said.
On asked to share his thoughts on his wife's feud with her fellow American Idol judge Nicki Minaj, the 32-year-old singer said, "I was a little disappointed with the producers, because that's not what American Idol is about. I felt like they fed off it a little bit.
"My wife is the classiest and strongest woman I've ever met, so she's handling it the way she's supposed to handle it," he said.