"After much soul searching and consideration, we have made the decision to separate as a couple," the pair said in a statement issued to ET. "We are, however, dedicated to remaining friends. There will be no further comment."
Sia, whose real name is Sia Furler, and Lang were married for two years and have no children. The couple tied the knot in 2014 after a whirlwind two-month engagement.
The news comes just one day after Sia scored three 2017 GRAMMY nominations, including one for the Zootopia song, "Try Everything," and two for her latest album, This Is Acting. She has spent much of 2016 promoting the project, including high-profile appearances and a nationwide tour, all while wearing her signature over-sized wig.