We've learned that Tonkin is set to take on the role of Hayley, a wild friend from Tyler's (Michael Trevino), who is described as free-spirited and extremely sexy (obviously, have you seen Tonkin?!)

Tonkin will first appear in episode three of the new season when Hayley pays Tyler a surprise visit. Watch out, Caroline (Candice Accola)!

The Australian's Mystic Falls debut marks her small-screen reunion with H20: Just Add Water co-star and real-life BFF Claire Holt, who plays original vampire Rebekah on the CW hit.