Scodelario took to Instagram to share the good news, posting a photo of the baby's hand beside their French Bulldog, Arnie.
"Welcome to the world little man. We couldn't be happier or more in love with you & Arnie's loving his new cuddle buddy," she captioned the photo.
The couple first announced that they are expecting their first child in June via Instagram.
Walker shared a photo of his pregnant wife and their dog on the beach, writing, "Happy summer from the four of us.. I love you @kayascods."'
Walker was previously married to Meryl Streep's daughter, Mamie Gummer, from 2011 to 2013.
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