This 22-year-old Aussie made her onscreen debut on a TV series in her homeland called 'H2O: Just Add Water,' but she's finally making her way to American shores this fall. Tonkin stars as the fabulously bitchy teen witch Faye, who causes plenty of trouble for our 'Secret Circle' heroine Cassie (Britt Robertson). We love to hate her already.

'The Secret Circle' premieres Thu., Sept. 15, 9PM ET on The CW