The Hollywood star, 53, and her musician husband Benji Madden, 47, shared news of the arrival of their son Nautas Madden in an Instagram post on Sunday.
The actress, 53, and the Good Charlotte rocker, 47, opted for low-key looks as they stepped out in New York on Saturday - marking their first public outing as a couple in four months.
The 53-year-old actress joined her husband of 10 years and their youngest child for a casual daytime stroll following their first public sighting together in over a year .
The Hollywood actress, 53, and Good Charlotte rocker, 46, who are notoriously private, married in 2015 and are parents to one-year-old son Cardinal and five-year-old daughter Raddix.