Scarlett Johansson's pregnancy could delay filming for The Avengers: Age of Ultron.

The 29-year-old actress is reportedly due to welcome her first child into the world with her fiance Romain Dauriac, 31, in August, but shooting for her upcoming movie, which kicks off on April 5, may need to be re-scheduled to fit around her growing baby bump.

The blonde beauty plays Natasha Romanoff in the superhero film, which sees her squeeze into a figure-hugging catsuit and bosses are reportedly keen to shoot her scenes as soon as possible. "Shooting for the superhero sequel will need a bit of rearranging. They're going to fast-track her scenes," a source said.

Meanwhile, Scarlett and Romain's baby news comes just six months after the French creative agency boss popped the question with a vintage Art Deco ring last year. However, the Captain America: The Winter Soldier star has previously said she and Romain don't want to "rush" tying the knot as "being engaged is an exciting time to enjoy and to really savor."