Quinlin Dempsey Stiller was born July 10 in Los Angeles and weighed in at 8 lbs. 2 oz.
The 39-year-old Meet the Fockers star and Taylor, 34, who costarred with her husband in Dodgeball and Zoolander, already have a daughter, Ella, 3. The couple wed after a whirlwind courtship in May 2000.
Ben Stiller's next project is a role in the musical comedy Tenacious D in the Pick of Destiny starring Jack Black. It is scheduled to come out next year.