February 01, 2015 03:15 PM

Splash News

Chris O’Dowd is officially part of the dad crowd.

The actor welcomed his first child, a boy, with his wife, writer and TV host Dawn O’Porter, on Sunday, Jan. 25, her rep confirms to PEOPLE.

“It’s a boy! [Dawn] & I would like to introduce Art, our gorgeous baby. Well, I’m pretty sure he’s ours,” O’Dowd joked via Twitter, sharing a mashup photo of a baby sporting his beard and his wife’s haircut.

Added O’Porter, “Thanks all. He is one week old today. It’s been a beautiful week. I think we’ll definitely keep him.”

O’Dowd, 35 — who wed O’Porter, 36, in August 2012 — announced his wife’s pregnancy while participating in the ALS Ice Bucket Challenge in August. After being showered with the cold splash, the dad-to-be nominated his unborn baby — a challenge completed when O’Porter poured water on her belly.

Known for his roles in Bridesmaids and on The IT Crowd, O’Dowd is currently appearing in St. Vincent and will next star in Icon, scheduled for release in August. His first children’s book, Moone Boy: The Blunder Years, based on the TV series, will be released in the U.S. in May.

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— Anya Leon with reporting by Sarah Michaud

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