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The 31-year-old, who starred in US show Sabrina the Teenage Witch, welcomed a son with husband Mark Wilkerson yesterday afternoon.
Braydon Hart Wilkerson was born after a 10-hour labour and weighed in at 7lbs 3oz, reports People magazine.
Hart previously said: "This has been a long but exciting pregnancy, and we along with Mason are excited to add to the Wilkerson clan."
She met her husband, a guitarist for rock band Course of Nature, at a Kentucky Derby event in May 2002 and they married in Italy the following year.
She gave birth to their first son Mason in January 2006.
