Kaitlin Olson and Rob McElhenney: Expecting Baby #2!

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Kaitlin Olson and Rob McElhenney of It's Always Sunny in Philadelphia fame are expecting a baby - the second in as many years for the married couple!

Son Axel was born to the couple last September.

Soon he'll have a baby brother to play with!

Kaitlin Olson, Rob McElhenney

"We're having a boy! 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," Kaitlin Olson said in a hilarious statement to TV Guide.

"We recently found out I was pregnant during my mom's birthday weekend in Ojai. I was instantly so proud of this baby for already knowing how to make someone else's special occasion all about him."

The couple's Always Sunny co-star Glenn Howerton, who plays Kaitlin's brother, and his wife welcomed their first child last month, while Charlie Day and Mary Elizabeth Ellis are expecting their first in December.

Olson and McElhenney have been married since 2008. Congrats to all!

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