‘Grease,’ ‘Xanadu’ Star Olivia Olivia Newton-John Dead At 73

One of the biggest pop stars of the ’70s and actress Olivia Newton-John has died at the age of 73. “Dame Olivia Newton-John passed away peacefully at her Ranch in Southern California this morning, surrounded by family and friends. We ask that everyone please respect the family’s privacy during this very difficult time,” her husband…