Katherine Evelyn Anita "Katie" Cassidy is an American actress from Los Angeles, California.
Her father, David Cassidy, was a pop star in the 1970s. Her mother, Sherry Williams, was a high fashion model in the early 1970's. Katie has appeared on the CW shows Supernatural, Melrose Place, and Gossip Girl; on the CBS miniseries Harper's Island; and in the films When a Stranger Calls (2006), Black Christmas (2006), Taken (2008), A Nightmare on Elm Street (2010), Monte Carlo (2011), and The Scribbler (2014). Katie can currently be seen playing the role of Laurel Lance/Black Canary on the CW TV series Arrow.