Miley Look-Alike Marrialle Sellars Sings 'Grenade' on 'Idol'Miley Look-Alike Marrialle Sellars Sings 'Grenade' on 'Idol'The very last audition on tonight's 'American Idol' (Jan. 22) was Miley Cyrus look-alike Marrialle Sellars, who sang Bruno Mars' 'Grenade.'Cassandra RoseCassandra Rose