Loved ones pay tribute to the beloved icon — who died of breast cancer on Monday at age 73 — in PEOPLE's latest cover story Rachel DeSantis is a senior writer on the music team at PEOPLE.

John Travolta and Olivia Newton-John met through their roles as Danny Zuko and Sandy Olsson in "Grease," but their real-life friendship went far beyond the hit 1978 musical film. The costars ...

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.

But what was the first song that allowed Newton-John to break through into the U.S. Top 40? You might be surprised to know it’s a track first recorded by two of the biggest names in the history ...