Kaitlin Olson and Rob McElhenney, costars on FX's It’s Always Sunny in Philadelphia, are celebrating the birth of their second son. Leo Grey was born Thursday at the couple's home in Los Angeles, People reports.

“We are overjoyed,” Olson, 36, and McElhenney, 34, said.

Weighing in at 8 lbs., 5 oz., Leo joins big brother Axel Lee, 19 months, who was also born at home.

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