CELEBRITY

Leo Grey McElhenney: Kaitlin Olson, Rob McElhenney Welcome Baby Boy

04/06/2012 09:24 am ET | Updated Jun 06, 2012

The It's Always Sunny in Philadelphia costars welcomed Leo Grey McElhenney at 1:15 a.m. on Thursday, April 5 at their home in Los Angeles, they tell PEOPLE exclusively.

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