Fans immediately began paying tribute to the beloved pop culture icon on social media.
"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," Easterling wrote.
"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," he wrote.
Many fans shared their favorite clips of the singer and actress, best known for her role as Sandy in Grease, as well as her hit single, "Let's Get Physical."
"We have lost a great, iconic artist in Olivia Newton John, gone too soon from us at age 73. I trust she is now in the great Xanadu beyond. Know that we are forever hopelessly devoted to you, Olivia. Rest in song and mirth," shared actor George Takai.
"Olivia Newton-John in Grease was what made me want to do musical theater. An absolute queen and a legend. This one hurts," shared a fan.
"My inner 11 year self is shattered. Farewell, Olivia Newton-John," wrote another fan.
Our thoughts are with Olivia's family, friends, and loved ones at this extremely difficult time.
Rest in peace.