The couple - who already have two daughters, four-year-old Isabella and two-year-old Gia, as well as Luciana`s daughter Alexis, 11, from a previous marriage - have revealed they are "thrilled" to be adding another girl to their brood.
Matt said: "It`s a girl! I`m thrilled. I just love my kids so much. I`m anxious to meet her."
The Oscar-winning actor admitted while he doesn`t think he is pampering his pregnant wife enough at the moment, living in New York means it is relatively easy to pander to her cravings.
He added: "I`m probably not pampering her enough. The one good thing I`ll say about living in New York as a dad is like, whatever craving she has, not only is it less than a block away but most times they`ll deliver. So it makes it really easy."
The 40-year-old star also explained that while he has achieved a huge amount of success in his career, being a dad is the most "exquisite" experience of his life.
Matt told OK! magazine: "It`s great, it`s really incredible. And just completely different from any other experience I`ve ever had in my life! It`s like relearning life. It`s actually kind of amazing. It`s just really exquisite."