Robbie arnett: Elizabeth Olsen and her husband Robbie Arnett

Elizabeth Olsen and her husband Robbie Arnett have been together since 2017. Though they keep their romantic life low-key, here's what we know about Robbie. Elizabeth Olsen and Robbie Arnett talk about their new children's book Hattie Harmony 'Opening Night'. Robbie Arnett (born March 03, 1992) is an American Singer, Songwriter, Celebrity Partner, and Musical Artist from Los Angeles, California. He is best known as Elizabeth Olsen’s fiancé who is an actress. At the young age of 22, she gained huge fame for her role as Martha in the film “ Martha Marcy May Marlene “. In fact, the actress also got nominated for Critics’ Choice Movie Award for Best Actress. So here's what we know about Robbie Arnett, Elizabeth Olsen's husband. Who is Robbie Arnett? Arnett, 31, is a musician from Los Angeles, who is part of the band Milo Greene.