“Rob and I are so excited it#39;s stupid,” Kaitlin Olson, 35, said at the time. “The last couple years have been pretty amazing for us and just when we thought things couldn#39;t get any better, the greatest little thing in the world happened! We#39;re totally beside ourselves.” There#39;ll be a new regular on the set of It#39;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.
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Kaitlin Olson give birth
