The movie star’s wife Camila Alves gave birth on Friday morning (28Dec12) at a hospital in Austin, Texas, reports TMZ.com.
McConaughey first announced the news his partner was pregnant in a tweet back in July (12) – a month after he and Alves wed.
The couple has been dating since 2006. McConaughey and Alves already have two kids, Levi, four, and two-year-old Vida.
Details of the newborn’s sex and name were not available when WENN went to press.