Scarlett Johansson has become a mother for the first time. The 29-year-old star of Lucy gave birth to a baby girl on Thursday, her publicist has confirmed.

Johansson, whose film credits include Captain America: The Winter Soldier and The Avengers, and her fiance, Roman Dauriac, have named the girl Rose.

A spokesman for the couple said that mother and daughter are doing very well. He added that the couple have asked for their privacy at this time.

Johansson became engaged to Dauriac in 2013. She was previously married to actor Ryan Reynolds.