Warpaint was joined by Kurt Vile last night during the encore of their show at the Echoplex in Los Angeles. He played guitar and sang backup vocals on “Baby,” a track from their 2010 debut album The Fool. The show was part of Red Bull Sound Select’s 30 Days In LA concert series, which Vile will be playing later in the month. Warpaint apparently gave the audience 3D glasses for the show, which transformed the lightbulbs above the stage into rainbow-colored hearts. They also said that it would be their last show for a while. Watch video of Vile’s appearance below.