Popsugar Celebrity Oscars Who Is Brie Larson's Boyfriend, Alex Greenwald? Who Is Brie Larson's Beloved Fiancé? You Probably Already Know Him February 25, 2017 by Shannon Vestal Robson View On One Page Photo 10 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Now, he plays the best supporting role to Brie. Here they are at 2016's SAG Awards, looking totally adorable. Previous Next Start Slideshow Brie LarsonCelebrity CouplesAward SeasonOscarsCelebrity FactsAlex Greenwald