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Olivia Newton-John, the iconic superstar who entertained millions as Sandy in "Grease," passed away on Aug. 8. She was 73. Olivia's husband, John Easterling, announced her death, saying the four-time Grammy winner was surrounded by family when she took her final breath at her ranch in Southern California. A source close to the star told TMZ that she died from "metastatic breast cancer." The "Physical" singer was initially diagnosed with breast cancer in 1992. It went into remission, but came back in 2013. Again, it went into remission but resurfaced in 2017. Following her death, many in entertainment publicly paid tribute to the actress-singer on social media, starting with her most famous co-star, John Travolta. "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!," he posted on Instagram.
Click through to see how she's being remembered by her peers…
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"Livvie brought the most divine light into the world… so much love, joy, inspiration and kindness… and we will always be hopelessly devoted to you" –Keith Urban and Nicole Kidman
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"Since I was ten years old, I have loved and looked up to Olivia Newton John. And, I always will. She was, and always will be, an inspiration to me in so many, many ways. My deepest condolences to her family and loved ones. x ONJ4EVER" –Kylie Minogue
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"My great friend Olivia Newton John has passed away. She was the perfect Lady, gorgeous, with great poise and with a certain Aussie sophistication. Her spandex trousers in Grease were my inspiration for my 'Da ya think I'm Sexy' era. RIP Olivia" –Sir Rod Stewart
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"Too young to leave this world. May she RIP. 😢🙏🏻 #OliviaNewtonJohn" –Barbra Streisand
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"Grease is my #1 movie of all time and made me a lifelong Olivia Newton John fan. Me and my sister watched Xanadu more times than I could count. Sending so much love and prayers to a real gift of a woman and talent. #RIPOliviaNewtonJohn" –Gabrielle Union
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"Olivia, you were the most gorgeous lady inside and out, you are a true Aussie icon and to play your daughter on screen in A FEW BEST MEN was beyond an honour. Seeing you star in the huge Hollywood blockbuster GREASE with your natural accent was so instrumental to me as a little girl, helping me to believe that it was possible for an Aussie girl to star in huge international musicals. You were the reason I auditioned for my high school production of GREASE at 15 – I was only in the chorus, but it was a start! You tried to teach me about health years before I took it seriously. You were so kind to me and it was such a blessing to know you Olivia. I'll never forget us singing at the piano in our lunch break on set together – what a complete legend you are! I am so sad you are gone 💗 Love and Light always to you ONJ, Rebel xoxo"–Rebel Wilson
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"A true class act whose light shined everywhere she went… she inspired us all A wonderful mother and wife, who was grace and strength personified. Sending all of my love to Olivia's family and friends. She'll never be forgotten." —Brooke Shields
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"Rest in peace, Olivia Newton-John. Deepest condolences to all of his family and loved ones" –Antonio Banderas
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"Like so many, Olivia has always been my hero. Discovering her magnetic energy as an artist and actress came first but it was her heart that truly captured mine. Forever an icon and legend!" –Julianne Hough
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"olivia newton-john forever" –Kelsea Ballerini
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"Hopelessly Devoted to YOU, Olivia Newton John. Rest In Peace, Queen. Thank you for the music." —Andy Cohen
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"For Olivia I love you. You were everything to me. Thank you for all you did for the world. I'm so sorry you're gone too soon. I'll forever cherish the note you left me backstage at Wicked. #hopelesslydevotedtoyou" –Kristin Chenoweth
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"Farewell with love to the legend who will forever be my first crush. Rest In Peace, Olivia Newton-John." –Daniel Dae Kim
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"Another angelic voice has been added to the Heavenly Choir. Not only was Olivia a dear friend, but one of the nicest people I had the pleasure of recording and performing with. I will most definitely miss her. She now Rests in the Arms of the Heavenly Father" –Dionne Warwick
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"Oh man!!! You were my childhood!! Your talent, poise, beauty!! Rest in glorious peace. God bless your family….and thank you for creating eternal memories." –Viola Davis
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"Devastated to hear this news. I loved Olivia." –Katie Couric
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"Grease is the word. Thank you for your gifts #OliviaNewton-John" –Johnathon Schaech
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"Rest In Peace Olivia Newton-John. Love you. xoxoxo Sending my deepest heartfelt condolences to all her family and loved ones." –Maureen McCormick
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"Fly with the angels Olivia newton John" –Rosanna Arquette
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"So Very Sad. She was everyone's sweetheart." –Paul Stanley
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"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." –Richard Marx
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"Very sad news. Great admiration for how she bravely faced breast cancer. Condolences to her loving family and friends." –Robin Roberts
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"thank you Olivia. –Sara Bareilles
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"Sweet Olivia has gone home. She was a beautiful soul and I know of no one who didn't love her or know what a great humanitarian she was. The world is out of balance when we lose these magnificent people. God speed Livvy. We will all meet again" –Rick Springfield
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"Olivia Newton-John rolled with EVERYTHING" —Kathy Griffin
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"ONJ. Angel." –Jane Lynch
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"Olivia Newton-John has died. That's it. I'm done guys. Heartbroken doesn't even BEGIN to cover it. I ADORED her. I hate this so much. She was only 73. What is going on?!," Yvette Nicole Brown tweeted. She added, "A little over twelve years ago, I geeked out at meeting one of my all time faves when she visited the set of Community. #OliviaNewtonJohn's hairstylist worked on our show. I think she was there to get a haircut in our hair trailer."
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"I am SO saddened at the news of the passing of Olivia Newton John. I remember being so star struck when I met her at my first Hollywood gathering for Paramount. She was the sweetest and brightest light and I loved getting to know her on 'It's My Party.' RIP dear, sweet Olivia." –Marlee Matlin
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"Your voice was unforgettable and your gracious words inspired us during an unimaginable time… Sending my love to you Chloe. Thank you Olivia" –Tamron Hall
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"Very sad that lovely, talented, brave Olivia Newton- John has died. I never got to meet her, but everyone says she was wonderful- always kind." –Mia Farrow
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"RIP Olivia Newton-John Thank you so much for wonderful music and fun memories." –Dane Cook
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"This makes me so sad! What a remarkable life and career… sending love to her family. Rest In Peace, Olivia Newton John" –Holly Robinson Peete
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"Always get sad when someone has been part of our life forever is no longer here. Can't even explain how much the movie Grease meant to me my dad my family and my wife. I think my favorite Olivia Newton-John song is Magic from Xanadu. I can never get that song out of my head" –Sebastian Bach
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"I never met Olivia Newton-John. I was only a hopelessly devoted fan. I'm told she was one of the dearest and kindest people. My sympathy to all her loved ones. #RIPOliviaNewtonJohn" –Jason Alexander
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"So sad to hear of the passing of Olivia Newton-John. I admired her talent & her compassion for our first responders." –Lee Greenwood
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"So sad to hear the fabulously gutsy, warm & talented Olivia Newton-John has died. At an auction of her Grease memorabilia in LA three years ago, she told me her favourite song from the movie was Hopelessly Devoted To You. Great song, great film, great lady. RIP." –Piers Morgan
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"Really sad to hear about the passing of Olivia Newton-John. My first real crush as a kid. I loved Grease & her music & I coincidentally also bought & lived in for a while the wonderful home she built in Malibu. May she Rest In Peace." –James Gunn
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"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." –George Takei
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"Today we lost an inspiring icon of the film & music industry, fly high Olivia Newton-John…" —Mario Lopez
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"'Hopelessly devoted to you' she sang. Sad to note passing of Olivia Newton John. We met during 2015 Celebrity Apprentice when she fabulously entertained. Wife Erica @elevrivera like many little girls was obsessed with Sandy the role Olivia played opposite John Travolta in Grease" –Geraldo Rivera
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"Along with having one of the most gorgeous, effortless voices in pop music. One of my first pop obsessions. RIP icon." –Billy Eichner