The ‘Wandavision’ star got engaged to her husband in 2019, and the pair secretly got married. Get to know more about Elizabeth Olsen’s husband Robbie Arnett. Discover everything about Elizabeth Olsen's husband, Robbie Arnett, from their meeting to their creative collaborations. Elizabeth Olsen and Robbie Arnett talk about their new children's book Hattie Harmony 'Opening Night'. Robbie Arnett is a pop singer and multi-instrumentalist who co-founded the indie band Milo Greene in 2009. He is also married to actress Elizabeth Olsen, with whom he wrote a book on self-care.