0903_sunny_getty"Always Sunny in Philadelphia" stars Kaitlin Olson and Rob McElhenney welcomed an addition to their family this week.

Olson gave birth to Axel Lee McElhenney on Wednesday at 12:52pm at the couple's Sherman Oaks home.

Olson joked with EW,  "I went into labor at the Phillies/Dodgers game on Tuesday night. As soon as Ryan Howard hit a 3 run home run, we felt comfortable leaving to go have our baby ... We love him like crazy, even though he made us miss the second half of the game."

The new season starts up September 16, Olson's pregnancy will be written into the show.

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