THEN: Olivia Newton-John
In 1981, Australian actress and singer Olivia Newton-John followed her success in the movie "Grease" by getting physical, physical with the Billboard charts. Newton-John's hit song "Physical" spent 10 weeks at number one, and went on to become the best-selling single of the 1980s. —XFINITY Entertainment Staff (Photo: YouTube, "Physical" video)
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