Katherine Evelyn Anita "Katie" Cassidy (born November 25, 1986) is an American actress. After initially appearing in minor television roles, she made her film debut in When a Stranger Calls (2006). During the same year, she also had her first starring role as Kelli Presley in Black Christmas (2006). In 2007, Cassidy gained attention for her role as Ruby on the supernatural-horror television series Supernatural, during its third season. She later had a supporting role in Taken. In 2009, Cassidy became a cast member of the series Harper's Island and Melrose Place, both of which lasted for only one season. During 2010, she had a supporting role in A Nightmare on Elm Street and a recurring role during the fourth season of Gossip Girl.