Matt Damon and his wife Luciana Barroso welcomed their fourth little girl, Stella Zavala Damon in New York on Wednesday.
'Mum and baby are both healthy,' Damon's spokesman said. 'The whole family is thrilled.'
Damon, who turned 40 earlier this month, and Luciana, 35, married in 2005.
They have already have three daughters together - four-year-old Isabella, two-year-old Gia and 11-year-old Alexis, from Luciana's previous marriage.
And baby makes four: Matt Damon and his wife Luciana Barrosa welcomed Stella Zavala on Wednesday in New York
When asked if he minded being surrounded by girls, Damon said: 'Its great, I grew up with a brother so it's a whole different world. There's a lot of princess outfits, not for me though.'
He also talked about his girls' distinct personalities.
There are huge differences amongst the girls, kids are amazing like that, same parents, same environment but they're all different,' he said.
'And with each one it becomes exponentially more complicated.'
Damon also added that he and Luciana are not planning on having any more children in the near future.
'God no,' he told Letterman. 'With four I'm kind of hoping they pair off and leave us alone!"
Damon may be a family man but he still manages to balance his daddy duties with his work. He's currently appearing in Hereafter, directed by Clint Eastwood.
And he's already hard at work on his next project, filming the Coen Brothers remake of the 1969 John Wayne Film True Grit .
