Olivia Newton-John has revealed her shock after a nurse who took care of her whilst she was receiving treatment for her cancer has passed away after a short illness.MORE: Olivia Newton-John's stunning swimsuit photo on beach is so nostalgic - see throwbackTaking to her Instagram, the Grease actress shared a picture of them both together, taken back in 2018, when Olivia was receiving treatment at the Olivia Newton-John Cancer Wellness & Research Centre in her native Australia. WATCH: Olivia