Actor Matt Damon and his wife are celebrating the birth of their second daughter. The actors spokeswoman said all were "doing great," adding: "She is a healthy, beautiful baby girl." The couple named their daughter Gia Zavala Damon, but no other details were released. Damon, 37, star of the "Bourne" action movies, and his wife, Luciana, 32, already have one daughter named Isabella, who was born in 2006. Meanwhile following months of speculation, it's been confirmed co-star Ben Affleck has a daughter on the way to actress wife Jennifer Garner. Affleck and Garner, who married in the Caribbean in June 2005 already have a daughter, Violet.