Dame Olivia Newton-John has died at the age of 73, her husband has confirmed.

The British-born singer died "peacefully" at her ranch in Southern California on Monday morning, surrounded by family and friends.

Her husband John Easterling confirmed the news in a statement on Newton-John's official social media pages.

"We ask that everyone please respect the family's privacy during this very difficult time," he wrote.

"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."

Easterling added that in lieu of flowers, donations should be made to Dame Olivia's foundation.

She is survived by her husband and her daughter Chloe Lattanzi, who shared a collection of photos with her mother on Instagram.

Newton-John is best known for her starring role in the 1978 filmGrease, in which she starred opposite John Travolta as Sandy. Her performance saw her nominated for multiple awards including two Golden Globes, and various other film accolades.

On Instagram, Travolta shared a touching tribute to his co-star, signing off "your Danny, your John".

"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," he wrote.

"Yours from the first moment I saw you and forever!"

Further tributes to the Australian icon have been flowing in, from Barbra Streisand to Hugh Jackman.