John Travolta Mourns Olivia Newton-John: Their Best Moments Together

John Travolta pays tribute to Olivia Newton-John. His iconic ’Grease’ co-star died on Monday. She was 73. Following the musical’s success, the actors reunited for ’Two of a Kind’ in 1983. Olivia and John opened up to ET over the years about their undeniable on-screen chemistry.