The expectant mom looked hip and casual in leggings, sneakers and a chambray shirt as they strolled through New York with their sweet treats from Milk Bar in the East Village. The couple ordered the shop's signature cereal milk soft-serve and shake, a source tells PEOPLE.
Johansson, 29, hasn't spoken publicly about her pregnancy and successfully hid her growing belly while filming the upcoming Avengers: Age of Ultron.
Still, she's shown her baby bump in chic but comfortable maternity outfits throughout the summer.
"New York is all about street style that's functional. A Paris look is not functional!" Johansson, who nows calls Dauriac's native France home, told Glamour in May. "It doesn't matter if your shoes are comfortable. Here [in New York] you can still wear your Nikes."