John Travolta and other celebrities paid tribute to "Grease" star Olivia Newton-John after her death was announced Monday.
"My dearest Olivia, you made all of our lives so much better," Travolta wrote on Instagram alongside a photo of the actress. "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!"
Michael Tucci who played Sonny, told Fox News Digital, "Olivia was special, she was a treasure to me and my family. An incredibly sweet and gracious person to everyone she encountered. I grieve for her family, and for John (Travolta)."
Didi Conn, who starred as Frenchy, said, "She signed her letters ‘Love and Light.' And that’s who she was- filled with so much love and light and generosity. She was not just a cancer survivor- she called herself a THRIVER! Her honesty about her disease moved her to raise millions for the Olivia Newton- John Cancer and Wellness Center in Melbourne, Australia. Her beautiful soul is shining right into my heart now and always!"
Newton-John's death was announced on her social media. The actress had been diagnosed with stage four metastatic breast cancer in 2017.
"Olivia has been a symbol of triumphs and hope for over 30 years sharing her journey with breast cancer," the statement read.
"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."
Other celebrities took to social media to pay tribute to the actress.
Suzanne Somers, who also battled breast cancer, spoke about Newton-John's passing.
"There is a sisterhood that grows larger every year," she said in a statement. "It's a sisterhood you never want to join but when allowed entry you find great comfort with other ‘sisters.’"
"Olivia provided great comfort for me when diagnosed 25 years ago," Somers continued. "Her fight was my fight , as she won, I won. She taught all of us so much through her bravery and 'never give up' philosophy . We got strength through Olivia and her example of life. As a 70's icon she lived a full life. I loved her and will miss my 'sister' forever."
Hugh Jackman wrote, "I’m devastated to hear the news that @therealonj has passed away. One of the great privileges of my life was getting to know her. Not only was she one of the most talented people I’ve known … she was one of the most open hearted, generous and funny. She was a one of kind spirit. It’s no secret Olivia was my first crush. I kissed her (poster) every night before bed. Her legacy will only grow stronger in the years to come. A fighter for healing from cancer that knows no bounds. I love you Olivia. @onjfoundation."
"My sweet friend--I will miss you forever," Patrick McDermott's ex-wife Yvette Nipar wrote on Twitter.
McDermott and Newton-John had dated before the Hollywood cameraman and lighting technician went missing. Newton-John and Nipar reportedly became close throughout the years following the disappearance.
Musician Richard Marx wrote: "My heart is broken. Rest now, sweet friend. You were as kind and loving a person as there’s ever been. I’ll miss you every day."
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Barbra Streisand shared a photo of herself with the actress.
"Too young to leave this world. May she RIP," she captioned the photo.
George Takei wrote, "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."
Musician Michael Des Barres shared his own tribute on Twitter.
"Olivia Newton-John had the extraordinary gift of while she sang and acted she became your sister," he wrote. "A member of your family. The Sweet brilliance she sent out into this fearful world was rar & beautiful."
Newton-John had an accomplished career as a musician, actress, entrepreneur, and activist. The "Physical" singer won four Grammys throughout her career and earned 12 nominations.
She was known for her hits "I Honestly Love You," "Hopelessly Devoted to You," and "Twist of Fate."
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On top of her music, Newton-John gained fame for her role as Sandy in "Grease." The film was released in 1978.
Other movies she was known for include "Xanadu" and "Two of a Kind."