April 10, 2012 03:00 PM

He’s the latest addition to the Always Sunny gang!

Kaitlin Olson introduced her and Rob McElhenney‘s newborn son via Twitter on Monday evening, writing, “Leo Grey McElhenney … born April 5th after 23 very very long hours. We’re in love.”

Baby Leo, along with his big brother, 19-month-old Axel Lee, were both born at the couple’s Los Angeles-area home. The newborn weighed in at 8 lbs., 5 oz and is 20 inches long.

Courtesy Kaitlin Olson

In addition to Leo and Axel, the Always Sunny cast has also recently welcomed Russell Wallace Day, Henry Hornsby and Miles Robert Howerton.

— Sarah Michaud

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