The 46-year-old star ditched her strawberry-blonde locks for her role as Catherine Parker in the Kim Farrant-directed thriller. Kidman wore her her new brown hair in a messy ponytail and and was dressed in a chambray button-down shirt while filming.
Incidentally the Australian actress also went brunette for her role in the upcoming film The Railway Man, out on April 11.
Strangerland will hit theaters in 2015.
2014: The Year in Music [PHOTOS]