#7: Olivia Newton-John – Then
Olivia Newton-John was one of the most beloved pop stars of the 1970s. She first rose to fame with soft, country-tinged pop hits like “If You Love Me (Let Me Know)” and “Have You Never Been Mellow.” Her gentle voice, sweet smile, and wholesome image made her a favorite worldwide.

In 1978, she became an international sensation playing Sandy in Grease. The film became a cultural phenomenon, and her transformation from shy schoolgirl to confident, leather-clad rebel shocked and thrilled fans. Grease made Olivia a full-fledged sex symbol, and the soundtrack became one of the best-selling albums of all time.
