A rep for the "Avengers: Endgame" star confirmed to the Associated Press that the couple, who have been dating for two years, are now engaged.
This will be the first marriage for Jost and the third for Johansson, who was previously married to Ryan Reynolds and then Romain Dauriac. Johansson and Dauriac share a 4-year-old daughter named Rose.
Jost and Johansson went public with their relationship in November 2017. They were most recently seen together at the premiere for "Endgame."