Australian singer and actress Olivia Newton-John and American actor John Travolta as they appear in the Paramount film 'Grease', 1978.
Getty | Paramount Pictures

John Travolta Pays Tribute To 'Grease' Costar Olivia Newton-John

On Monday afternoon, it was reported by TMZ that legendary actress and singer Olivia Newton-John had passed away. She was 73.

There has not yet been an official cause of death that has been released, but a source told TMZ that she died due to her longtime battle with breast cancer. The world has truly lost one of Hollywood's major icons, and we will forever remember her.

Her husband, John Easterling, put out a statement on Facebook to announce her death.

Olivia Newton-John waving in 'Grease'
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"Dame Olivia Newton-John 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."

Olivia Newton-John singing "you better shape up."
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"Her healing inspiration and pioneering experience with plant medicine continues with the Olivia Newton-John Foundation Fund, dedicated to researching plant medicine and cancer. In lieu of flowers, the family asks that any donations be made in her memory to the @onjfoundation."

Naturally, the whole world is shaken up by her passing.

People online are reminiscing about the iconic actress and her amazing voice. She brought people together, and her legacy will never be forgotten because of it, that is for certain.

Olivia Newton-John's costar John Travolta has released a statement about her death.

Australian singer and actress Olivia Newton-John and American actor John Travolta
Paramount PIctures | Paramount Pictures

He took to Instagram to give his own heartfelt tribute, where he talked about how much he loved his costar and friend.

Excuse me while I sob over here.

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