Britt Robertson

Life Unexpected star Brittany Robertson will star in CW's Secret Circle, TVGuide.com has confirmed.

Based on the three-book series from The Vampire Diaries author L.J. Smith, Secret Circle follows Cassie Blake (Robertson), a young witch who moves back to her mother's mystical hometown. Unaware of her powers at first, Cassie may be the key that will unlock the battle of good versus evil.

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Robertson will be free to join Circle unless Life Unexpected gets picked up for a third season, which looks unlikely.

Diaries ' Kevin Williamson will executive produce.