"Ok. For real ;) My amazingly strong wife home-birthed a happy and healthy baby boy last night :). Please send love :))," the "Supernatural" star tweeted Monday.
E! News said no other details regarding the child's birth have been released.
The couple, who were married in 2010, also have a nearly 2-year-old son named Thomas Colton.
Celebrity Families of 2014 [PHOTOS]