She has been working at PEOPLE for 17 years. Singer-songwriter and actress Olivia Newton-John — a four-time Grammy winner and star of beloved movie musical Grease — has died. She was 73.

John Travolta and Olivia Newton-John reunited in December to reprise their iconic roles for a Grease sing-along in Florida Sandy and Danny forever! Last month, Grease stars John Travolta and ...