April 5: Leo Grey McElhenney
"It’s Always Sunny in Philadelphia" co-stars Kaitlin Olson and Rob McElhenney welcomed their second son, Leo Grey McElhenney, on April 5, 2012 at their home in Los Angeles. The couple are also parents to son Axel Lee, born in September of 2010. —XFINITY Entertainment Staff (Photo by Frazer Harrison/Getty Images)
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