This paper examines online fan fiction communities as spaces for identity formation, collaborative creativity, and fan empowerment. Drawing on case studies of a LiveJournal fan fiction community, fan-written essays, possible world theory, and postmodern theories of the hyperreal and simulacrum, this paper argues that writing fan fiction is a definitive, postmodern act that explores the mutable boundaries of reality and fiction. It concludes that fans are no longer passive consumers of popular media—rather, they are engaged, powerful participants in the creation of celebrity representation that can, ultimately, alter reality.