The two were spotted in L.A. with their baby, who was born in December (the sex is unknown). An insider told Page Six, "They've had a baby, and how they kept it a secret nobody knows… Steve's very private."
Martin and Stringfield "are thrilled," a source said. "They worked hard to have the baby."
Martin divorced first wife, actress Victoria Tennant, in 1994. He wed Stringer, a writer and former New Yorker editor, in July 2007.
Comic actor Steve Martin has become a father for the first time at age 67! He and wife Anne Stringfield welcomed their first child, says Page Six.