Ben Affleck and Jennifer Garner Welcome Baby Boy

Ben Affleck and Jennifer Garner at Golden Globes - P 2011
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This is the third child for the couple, who are parents to daughters Seraphina, 3, and Violet, 6.

It's a boy for Ben Affleck and Jennifer Garner.

The actor announced the news Wednesday afternoon on his Facebook page, saying: "We are happy to announce on February 27, Jennifer gave birth to a healthy baby boy, Samuel Garner Affleck."

Married since 2005, Affleck and Garner are also parents to two little girls: 6-year-old Violet and 3-year-old Seraphina. The pair went public with Garner's pregnancy last August.

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The multi-hyphenate Affleck, 39, is the director and star of the upcoming Warner Bros. hostage thriller Argo, which he's also producing. It's slated for release in September and co-stars Alan Arkin, Bryan Cranston and John Goodman.

Garner, also 39, recently filmed a role in the Weinstein Co. political comedy Butter.