Katherine Evelyn Anita "Katie" Cassidy (born November 25, 1986) is an American actress. She portrays Laurel Lance/Black Canary in a lead role in the first four seasons of Arrow, and also special guest starred in the first season of The Flash. She reprised her character in a guest starring role in the first season of DC's Legends of Tomorrow. She portrayed her Earth Two equivalent, Laurel Lance/Black Siren, in a guest starring role in the second season of The Flash. She will also voice her character in a special guest star in the second season of Vixen.