Lauren Cohan or Katherine Isabelle to be a vamp on Vampire Diaries

There will be a new vampire on CW's 'Vampire Diaries,' and two different sources are naming two different Supernatural alum as the actor portraying her.  Michael Ausiello is saying that Katherine Isabelle (Ava Wilson of the psychic kids) will be portraying Rose the vampire, while Zap2it is saying that Lauren Cohan (Bela Talbot) has attained the role.