Olivia Newton-John passed away on Monday at the age of 73 after a very long – and very public – battle with breast cancer. The iconic “Grease” star may be gone, but she is not forgotten. Olivia not only left behind an incredible body of music and film work, she spent the last three decades as a fierce advocate for cancer awareness. And after she died, an outpouring of loving tributes flooded social media from some of her famous friends. RIP, Olivia. We honestly love you.

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