TOPSHOT - Flowers and a photo are placed on the star of Australian singer and actress Olivia Newton-John on the Hollywood Walk of Fame in Hollywood, California, on August 8, 2022. - Australian singer Olivia Newton-John, who gained worldwide fame as high-school sweetheart Sandy in the hit musical movie "Grease," died on August 8, 2022, her family said. She was 73. The entertainer, whose career spanned more than five decades, devoted much of her time and celebrity to charities after being diagnosed with breast cancer in 1992. (Photo by Robyn Beck / AFP)