Aro replies, "Fore. Ne il vostro l'uno o altro.", the translation in English means "Perhaps. Nor yours either."
Also, in the movie version of New Moon, I caught something along the lines of "cantante" which can be translated as singer, supporting the idea that Bella is Edward's "singer" because her blood appeals to him. It is also mentioned that Alice was James' singer and/or possibly the singer of the vampire who saved her.