Olivia Newton-John, 'Sandy'
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'Grease': Then And Now
3. Olivia Newton-John, 'Sandy'
Olivia Newton-John was already a huge singer in her native Australia before 'Grease', but the classic musical film propelled her to new levels of fame. Since then, hits like 'Xanadu' and 'Physical' have helped her sell over 100 million records worldwide, making her one of the most successful artists of all time.