The 31-year-old actress separated from Gibbard, the frontman for Death Cab for Cutie, in October and filed divorce papers on Dec. 27 citing "irreconcilable differences."
"It was mutual and amicable," a source told Us Weekly when the separation was reported, adding, "there was no third party involved."
The "New Girl" star and Gibbard, 35, were married in Seattle in September 2009.
"I'd seen her movies and obviously I thought she was very beautiful," he told New York magazine in September, about meeting his future bride.
In the same article, the actress described her husband as "a very conscientious person."