"Mom and baby are both healthy. The whole family is thrilled," Matt Damon's rep told Access Hollywood.
Matt and Luciana, who have been married since 2005, made the announcement they were adding to their girl-heavy family back in April.
Stella Zavala Damon is joining sisters Isabella, 4, Gia, 2, and Luciana's 11-year-old daughter, Alexia, from a previous marriage.
"It's pretty easy to kind of lose your way. I think working consistently with great people is really helpful. Also having kids is really helpful. They kind of disabuse you of the notion of your greatness pretty quickly," Matt Damon told Parade back in April of having a family.
"There's a routine that you get into with kids that precludes you from going back to your single days. I'm probably more boring than I used to be. I go to bed earlier and I get up earlier."
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