The 25-year-old singer opened up about his wife's pregnancy during a TV show, reported Us magazine.
"It's true -- Danielle is pregnant! Can't even imagine how excited we are... I was overjoyed when I learned Danielle is expecting. It has been the most exciting thing in my life so far," Kevin said.
"I'm excited and I'm nervous," he added.
The couple met while vacationing in the Bahamas on May 23, 2007 and tied the knot two years later at Oheka Castle in New York's Long Island. The newlyweds honeymooned in Cabo San Lucas, Mexico.