Actor John Travolta has honoured the life and memory of Australian icon Olivia Newton-John.

Australian singer and actress Olivia Newton-John has passed away this morning after a long battle with cancer.

Travolta released a tribute to Olivia Newton-John on his social media;

"My dearest Olivia, you made all of our lives so much better," he captioned a throwback photo of Newton-John. "Your impact was incredible. I love you so much. We will see you down the road and we will all be together again."

"Yours from the moment I saw you and forever! Your Danny, your John!" he concluded.