updated 07/08/2010 AT 5:20 PM ET
•originally published 07/08/2010 AT 5:25 PM ET
Kick Ass actor Aaron Johnson and his fiancée Sam Taylor-Wood – whose romance made headlines because of their 23-year age difference – are now the proud parents of a baby girl.
Taylor-Wood, 43, a filmmaker and the 20-year-old British actor welcomed Wylda Rae to the world on Wednesday in London, their rep confirms to PEOPLE.
The couple, who met in 2009 on the set of her directorial debut, Nowhere Boy, raised eyebrows when they first stepped out together at a premiere earlier in the year. Taylor-Wood is already a mother of two from an 11-year marriage to art dealer Jay Jopling.