Driver, 38, is best known for her roles in the movies "Circle of Friends," "Good Will Hunting" and "An Ideal Husband," as well as for her work on the TV series "The Riches."
Driver's representative, Jessica Kolstad, told People magazine the actress gave birth to Henry Story Driver last Friday in Los Angeles. The child weighed 9 pounds, 12 ounces, Kolstad said.
Although the movie and TV star hasn't identified the baby's father, she told People in June he will be part of their child's life.
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