The True Blood star, who took the stage alongside friend James Franco in Broadway's Of Mice and Men this summer, popped the question to the Hunger Games actress on Aug. 6, at Mt. Bonnell in Austin, Texas, his rep confirms exclusively to PEOPLE.
Parrack sealed the deal with a Monique Pean Mineraux engagement ring.
The couple began dating in the spring, the night Of Mice and Men premiered, and Parrack, 33, divorced his wife of six years in June after separating in September.
Leven, 24, has also appeared on The Tomorrow People and One Tree Hill. This will be her first marriage.
Reporting by JENNIFER GARCIA