Artist Sam Taylor-Wood is expecting a child with her 19-year-old fiance, her spokesman said.
The 42-year-old, who is also a film-maker, already has two daughters from her marriage to art dealer Jay Jopling.
Taylor-Wood began a relationship with actor Aaron Johnson while making the John Lennon biopic Nowhere Boy, currently on release.
Her spokesman said last night: "Sam is pregnant with her and Aaron's first child. Both are very, very happy." He did not say when the baby was due.
Last month the London-born artist, said of Johnson: "We'd definitely work together again -- he's a brilliant actor. There was an intensity when he walked through the door."