John Travolta shares heartbreaking statement following death of Olivia Newton-John

The actor, 68, took to Instagram to pay tribute to his Grease co-star, who passed away at the age of 73 at her ranch in California.

The pair starred together in the 1978 musical, which went on to have one of the bestselling soundtracks of all time.

Travolta wrote in the heartbreaking post: "My dearest Olivia, you made all of our lives so much better. Your impact was incredible. I love you so much. We will see you down the road and we will all be together again."

Travolta concluded the post: "Yours from the first moment I saw you and forever!

Your Danny, your John!"

The heartfelt words were a reference to the actors' ongoing friendship and, of course, the Grease song, 'We Go Together', as well as John's iconic character, Danny Zuko.

Fans of the actors were quick to take to the comments section to share their sympathies. One fan simply wrote: "Danny and Sandy for life."

"I immediately thought of you when I heard the news," added a second. "Peace be with you and all of us who loved her."

"I’m so sorry for the loss of your friend. We all loved her," wrote a third while Peter Andre, who is currently starring in a London production of Grease, wrote: "What incredible words."

"Never will there ever be a couple like Danny and Sandy," added another fan. "What a lovely tribute to the legend that was Olivia – forever remembered."

News of Newton-John's death was revealed on her official Facebook page in a statement from her husband, John Easterling.

The statement read: "Dame Olivia Newton-John (73) passed away peacefully at her Ranch in Southern California this morning, surrounded by family and friends.

"We ask that everyone please respect the family’s privacy during this very difficult time.

"Olivia has been a symbol of triumphs and hope for over 30 years sharing her journey with breast cancer.

"Her healing inspiration and pioneering experience with plant medicine continues with the Olivia Newton-John Foundation Fund, dedicated to researching plant medicine and cancer.

Newton-John was first diagnosed with breast cancer in 1992 and bravely battled multiple recurrences of the disease.

If you have experienced a bereavement and would like to speak with someone in confidence contact Cruse Bereavement Care via their national helpline on 0808 808 1677