The blonde bombshell, known for her roles in Rock of Ages and Watchmen, gave birth yesterday to a "healthy baby boy", she announced on Twitter.
"My husband and I welcomed our beautiful, healthy baby boy to this world this morning! Biggest joy of my life!!! #lovemykid," she wrote, before adding: "PS and his name is ... Sebastian Zincone :))) Love him more than life itself!! ?#whatafeeling?"
Little Sebastian is the first child for 34-year-old Malin and musician husband Roberto Zincone, who have been married since 2007.
Cute! Now that's a celebrity baby we can't wait to get a glimpse of.