The Martha Marcy May Marlene star enrolled at New York University's Tisch School of the Arts after high school in 2007 and has been alternating between classes and film jobs for the past few years, even studying abroad in Russia in 2009.
And now all her hard work has paid off.
Olsen, who majored in theatre, tells Us Weekly, "It was not easy, but I always made it a priority. Obviously the degree is not going to do much for me now. Maybe I can hold it over my future children's heads."
And the 23 year old plans on celebrating her big achievement with family and friends.
She adds, "(It'll be) just a dinner with a couple friends and my parents. All my friends graduated three years ago!"