io9 exclusively reports that Sigourney Weaver will play as an ancient vampire in Vamps , directed by Amy Heckerling of Clueless legend. Weaver would put on fangs for the malevolent role of Cisserus, a "stem vampire." It's Heckerling-speak for a generally ravenous, bloodsucking immortal. Release date is tentatively tacked on 2012.