October 23, 2010 08:00 PM

Jemal Countess/Getty

Matt Damon and his wife Luciana have their hands full.

The couple, already raising three children, welcomed a girl, Stella Zavala Damon, on Wednesday, Oct. 20 in New York.

“Mom and baby are both healthy,” Damon’s rep tells PEOPLE. “The whole family is thrilled.”

Damon, who turned 40 earlier this month, and Luciana, 35, wed in 2005 and have two children together — Isabella, 4, and Gia, 2. Luciana also has a daughter, Alexia, 12, from a previous marriage.

Damon’s next film, Hereafter, is in theaters now.

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