is pregnant with her third child with husband Ben Affleck.
The 39-year-old actress and the 'The Town' star - who already have two daughters, Violet, five, and two-year-old Seraphina - are said to be "thrilled" about their impending new arrival, according to a statement released by the couple to the Associated Press.
Friends of the pair claim Jennifer and Ben have been trying for a child for some time as they have been hoping to expand their brood.
A source said: "She's always wanted three kids. This was her plan all along."
While no other details about the pregnancy
have yet been released, it is thought Jennifer is currently in her second trimester.
The brunette beauty
has previously admitted finding the balance between working and being a mother can be "tricky".
She explained: "It's tricky, I don't think there's any right way to be a mom. Whatever works for you, don't judge yourself for it.
"And don't let others judge you. Just do what feels best for your family, and if that's going to work, then go to work with your head held high, and if that's staying at home, then don't let yourself feel any less for being at home with your kids."