Pregnant Scarlett Johansson was all smiles as she and fiance Romain Dauriac got a little exercise in London on May 30 Credit: AKM-GSI

Now showing! Pregnant Scarlett Johansson gave onlookers a glimpse of her growing belly when she stepped out in London with fiance Romain Dauriac on Friday, May 30. 

The Her actress, 29—who's in the U.K. to film the Avengers sequel, Age of Ultron—was all smiles as she and Dauriac strolled down the street together in workout clothes. She dressed her new curves in dark gray leggings and a light gray zip-up sweatshirt, the hood of which she wore pulled over a black baseball cap.

French journalist Dauriac, meanwhile, wore a bright blue track jacket, black leggings, and black workout shorts. He seemed to be in a playful mood, and was photographed jumping around as Johansson kept pace beside him. At other points during the walk, the happy couple linked arms.

Speaking about their relationship in an interview for the April issue of WSJ magazine, the Under the Skin star said they lead a relatively low-key existence. "Our life is quiet," she told the mag.

Not for long, though. Engaged since September 2013, the couple will welcome their first child later this year. Johansson is looking forward to having a family, but she'll have to learn to balance that with her career. "I know that with that there will be some sacrifices," she told WSJ.

Still, "there must exist a world in which I can balance those things, be able to raise a family and still make a film a year, or work on my own, develop things, do theater," she added. "I want to be able to have it all. Selfishly."