Newton-John died Monday morning at her ranch in Southern California, her husband, John Easterling, announced on Facebook.

Born on Sept. 26, 1948, in Cambridge, England, the iconic singer and actress had success on both screen and stage. Newton-John sold more than 100 million albums and had nearly 40 entries on the Billboard Hot 100 during her five decades in music. Her popularity rose even more for her portrayal of Sandy Olsson opposite John Travolta as Danny Zuko in Grease (1978).

John Travolta took a moment to say good-bye to his girl Sandy, played by the incomparable Olivia Newton-John, after her passing was announced on Monday August 8.

They’ll forever be known as Danny and Sandy by generations of fans who loved the movie musical, Grease. Sadly, the pair, who were as close in real life as they were on screen, will never be together again, as Olivia Newton-John passed away on Aug. 8 after a 30 year battle with cancer. After the news of her passing, John Travolta paid tribute to his friend with a sweet, yet sad message.

Rest in peace, Olivia Newton-John

Hollywood mourns the loss of yesteryear diva Olivia Newton-John