Shortly after her second divorce, Johansson revealed that she hadn't lost faith in marriage. "The idea of building a family, making a family, and having that work, I like that idea," she told Vanity Fair. "I think that would be wonderful. I've always wanted that. I wanted that also in my marriage to my daughter's father as well."

It seems that Johansson has found the right person in Colin Jost, who she married in October 2020 (via Elle). The couple initially started dating in 2017 before making it red carpet official at the premiere of "Avengers: Infinity War" in April 2018, per Brides. Jost proposed a year later, and by the end of 2019 Johansson declared that Jost was the love of her life during an appearance on "SNL" (via YouTube). 

In August 2021, the couple revealed they'd had their first child together — a son called Cosmo. Speaking on an episode of "Late Night with Seth Meyers", the host explained how his mom wasn't too sure about the name they chose. "My mom, I would say was slightly thrown by it," he said. "[She] didn't quite understand it, I don't know if she thought it was kind of like a hippy thing." Johansson would go on to tell Access Hollywood that the name just "came out of the ethos" and that there wasn't really any explanation behind it (via YouTube).