It’s hard to believe, but in a few weeks Olivia Newton-John turns 70. Sunday Night looks back at Olivia’s extraordinary career with the help of her dearest friends. From the classic hits, to blockbuster movies like ‘Grease’, Olivia is undoubtedly one of our most celebrated stars. But in recent years, it’s her fight against cancer that’s been in the headlines. Olivia sits down with Sunday Night’s Alex Cullen for this very candid interview to reveal the secret she’s refused to tell until now.