Kaitlin Olson and Rob McElhnney is going to be parents again.

Kaitlin Olson and Rob McElhenney both of whom are the stars of "It's Always Sunny in Philadelphia" stars are expecting their second child in the coming spring People reports. They married in 2008 and the baby will join it's big brother 13th months old Axel Lee. Olson�s reported her second pregnancy, as she said People Magazine, while she was celebrating her mothers birthday.

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She said to People, �We 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 day all about him."

The are happy that they are having their second baby. �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,� 36 year-old the actress told the magazine.

"It's Always Sunny in Philadelphia" team.