The 29-year-old actress has welcomed a healthy baby girl named Rose, her rep confirmed to The Insider
With Yahoo on Thursday. News of the pregnancy first broke back in March, though Johansson never formally commented on the rumors.
This is the first child for the Lucy star and her French journalist fiancé, Romain Dauriac, who confirmed their engagement last September.
Johansson's rep said that both mother and daughter are doing well and are seeking privacy, noting that the actress is a supporter of the No Kids Policy, the star-studded effort to keep celebrity children away from the public eye.
Though Scarlett did an excellent job of concealing her pregnancy for many months, by early summer, she had given up trying to hide her (very obvious) baby bump. In June, she was snapped wearing fitted workout gear with Dauriac in Paris, and in July she was photographed kicking around New York City with her growing midsection highlighted by a bright red top.