Chloe Lattanzi has paid tribute to her late mother and 'best friend', Olivia Newton-John, with a powerful post on social media. The 36-year-old took to Instagram yesterday to honor the Grease star, who died in California on Monday (August 8) after a 30-year-long journey with breast cancer. The heartwarming update comes amid a flood of tributes for Olivia Newton-John from grieving celebrities, including John Travolta, Oprah Winfrey, and Kylie Minogue.