Ashlee Nicole Wentz (born October 3, 1984 As Ashley Nicole Simpson) Is An American Pop Rock Singer-songwriter, Dancer And Actress. Simpson-Wentz, Who Is The Younger Sister Of Pop Singer Jessica Simpson, Rose To Prominence In Mid-2004 Through The Success Of Her Number-one Debut Album Autobiography And The Accompanying Reality Series The Ashlee Simpson Show. Simpson Received Widespread Criticism When She Used A Pre-recorded Vocal Track On Saturday Night Live In October 2004.