September 02, 2010 05:00 PM

Craig Barritt/WireImage

There’s potential for a new employee at Sterling Cooper — Rich Sommer has welcomed a baby boy.

The Mad Men star’s wife Virginia delivered their second child, son Patrick Ryan Sommer, on Tuesday, Aug. 31 in Los Angeles, his rep confirms to PEOPLE.

Patrick weighed in at 7 lbs., 9 oz., is 21 inches long and joins big sister Beatrice, 2½.

“We are loving hanging with our happy, healthy baby boy, and appreciate our family and friends joining us in celebrating this exciting time,” Sommer, 32, tells PEOPLE in a statement.

“Also, he looks way better than I do in a onesie.”

Speaking with PEOPLE Saturday night, the actor promised not to evoke a notorious ’60s dad in the hospital waiting room.

“I’ll try to remain coherent at all times so that I’m not the terrible father that welcomes his son into the world in a fog of pain and alcohol,” Sommer joked. However, he does have the perfect excuse — he was only trying to stay in character: “Son, I was rehearsing.”

— Sarah Michaud with reporting by Kate Hogan and Scott Huver

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