Bottoms Up! It's Always Sunny in Philadelphia Costars Preparing for Baby No. 2

Kaitlin Olson and Rob McElhenney, who already have a 13-month-old son, are expecting another boy this spring

Not that the folks at Paddy's Pub ever need a reason to drink, but here's one nonetheless.

Rob McElhenney and Kaitlin Olson, who star together on It's Always Sunny in Philadelphia, are expecting their second child this spring, People reports.

The husband-and-wife comedy duo also reveal, more specifically, that they'll soon be giving their 13-month-old son Axel a little baby bro.

"We're having a boy!" Olson tells the mag. "We're so happy that Axel gets to have a brother so close in age. And that I get to add another set of balls to my very, very male world."

Cheers, you two!