Noah Cyrus is Miley Cyrus' younger sister. Noah has had small extra roles on Hannah Montana and will be doing the voice of a character along with Frankie Jonas in a new animated movie. She resembles Miley quite a bit; and the two sisters have a good relationship.
Person #1:Hey, who is Noah Cyrus?
Person #2: Oh, that's mileys little sis. She was in Hannah Montana. I think she played a little girl in the episodes, achey jakey heart and its a mannequins world.