Kaitlin Olson and Rob McElhenney welcome son Leo Grey

Looks like things are getting even more "sonny" for Kaitlin Olson and Rob McElhenney. The "It's Always Sunny in Philadelphia" stars welcomed a new boy to their brood on Thursday (April 5).

People magazine is reporting that the couple gave birth to Leo Grey McElhenney at 1:15 a.m. The baby boy came in at 8 lbs., 5 oz. and is 20 inches long.

"We are overjoyed," the couple says in a statement.

This is the second child for the couple. Axel Lee is 19-months old.

Olsen and McElhenney married in 2008.