Larson, 26, and the Phases rocker (formerly of Phantom Planet), 36, have been dating for several years. Greenwald was frequently by the actress’ side on the 2015-2016 awards circuit, during which she won numerous honors for her performance in Room.
Before getting a special shout-out during her Academy Awards acceptance speech (“Alex Greenwald, I love you”), Larson told Entertainment Tonight at the Screen Actors Guild Awards, “He’s the other half of the equation – how can you explain support? I mean, it goes beyond anything. He’s just my person, he’s my best friend.”