September 02, 2010 06:15 PM

Michael Kovac/FilmMagic

There’ll be a new regular on the set of It’s Always Sunny in Philadelphia this fall.

Costars Kaitlin Olson and Rob McElhenney welcomed their first child, son Axel Lee McElhenney, at 12:52 p.m. on Wednesday, Sept. 1 at their California home, they tell PEOPLE exclusively. He weighed in at 8 lbs., 7 oz.

“I went into labor at the Phillies/Dodgers game on Tuesday night,” says Olson, 35.

“As soon as Ryan Howard hit a three-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 FX cult comedy hit, which McElhenney created and executive produces, will return for its sixth season on Sept. 16.

— Ulrica Wihlborg

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