The Sweet Home Alabama star's wife Jessica gave birth to a son on Friday (June 29) , People reports.
Their new addition, Noah Rev Maurer, weighed 9lbs 4oz at birth.
Lucas married Jessica in March and the couple announced days later that they were expecting their first child.
Lucas most recently appeared in The Firm, which aired on NBC for one season.
His other credits include movies such as J. Edgar, The Lincoln Lawyer and A Beautiful Mind.