Kristen Stewart has come on board Brydie O’Connor’s documentary “Barbara Forever” as an executive producer as Strand Releasing acquires all North American rights to the film, which had its world premiere at the Sundance Film Festival followed by its international premiere at the Berlin Film Festival. The film, which chronicles the life and career of filmmaker Barbara Hammer, was produced by Space Time Films with Christine Vachon and Killer Films serving as executive producer. Stewart has also