Former Miss Teen USA Shelley Hennig (“Days of Our Lives”) has been cast as head witch Diana on writer/producer Kevin Williamson’s small-screen adaptation of author L.J. Smith’s “Secret Circle.” Canadian starlet Jessica Parker Kennedy (Now) also joins the show as Melissa, a member of Diana’s coven.

“Secret Circle” stars Brittany Robertson (“Life Unexpected”) as a California teen named Cassie who discovers she’s a witch while living with her mother in New Salem. Costars include Phoebe Tonkin (Bait 3-D) as witch Faye and Thomas Dekker (Nightmare On Elm Street) as Adam the eldest member of the coven and Cassie’s new crush.

Williamson, the creative force behind the Scream and I Know What You Did Last Summer films and the TV series “Dawson’s Creek” and “The Vampire Diaries,” is penning the pilot for The CW and will serve as executive producer. Cameras are set to roll this month in Vancouver.