"The Big C" and "The Truman Show" actress and her husband, Marc Schauer, welcomed a baby boy on Jan. 8, her rep confirmed to People.
The little guy has a pretty big name: Bennett Armistead Schauer. He's a first child for the couple, who married in May 2009 after getting engaged in 2007.
Linney pulled off what's a pretty difficult trick when one's job entails walking the red carpet from time to time: She kept her pregnancy off the celebrity radar until now!
She's a three-time Oscar nominee, as a lead actress in "The Savages" and "You Can Count on Me" and supporting actress in "Kinsey."