May 04, 2012 02:15 PM

Paul Archuleta/FilmMagic

Surprise — it’s a girl for Mira Sorvino!

The actress, 44, gave birth to her fourth child, daughter Lucia, on Thursday, May 3 in Los Angeles, her rep confirms to PEOPLE exclusively.

“We are thrilled beyond measure to have been blessed with our fourth precious, healthy child,” Sorvino and husband Christopher Backus tell PEOPLE.

Lucia joins elder siblings Holden, 2, Johnny, 5, and Mattea, 7.

Next up for Sorvino is Union Square, out in July, while Backus, 30, will make his directorial debut in The Sessionist this summer.

— Sarah Michaud with reporting by Julie Jordan

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