The 61-year-old star of "The Avengers," "The Girl with the Dragon Tattoo" and "Mamma Mia!" now has seven sons and a daughter, The Hollywood Reporter said.
Skarsgard's representative told the entertainment industry trade newspaper the actor's wife, Megan Everett, gave birth to a healthy son in Stockholm Friday. The couple also are the parents of a 3-year-old son.
The star has six other children from a previous marriage.