The longtime lovebirds swapped vows over the weekend, her rep confirms to People magazine.
Filmmaker Lance Bangs broke news of the couple's nuptials when he shared an Instagram photo of the newlyweds slow dancing at their wedding with their arms wrapped around each other.
"Yo La Tengo playing Superchunk, Mission of Burma, and Pixies covers at David and Amber's wedding," Bangs wrote.
The 29-year-old Sisterhood of the Traveling Pants star and 48-year-old Arrested Development funnyman announced their engagement in August 2011 after dating for two years. (Last month, Tamblyn was one of the few close friends invited to Pants pal Blake Lively's wedding to Ryan Reynolds.)
This is the first marriage for both Tamblyn and Cross.
(Originally published Oct. 7, 2012, at 12:48 p.m. PT)