Set up by the runaway success of the alterna-pop single "Torn", debut album by Australian child actress-turned-songwriter Natalie Imbruglia exploded onto The ''Billboard'' 200 at No. 10 last issue and stays impressively high this issue. The photogenic, UK-based singer--whose career path is not too different from that of Canadian contemporary Alanis Morissette--stands to follow the success of "Torn" with such other viable pop and rock cuts as "Leave Me Alone", "Don't You Think", "Impressed" and "Wishing I Was There". An album with ample possibilities at modern AC, modern rock, mainstream rock, and pop stations.