John Travolta and More React to Olivia Newton-John's Death: "Made All of Our Lives So Much Better"

Carey shared a photo of herself performing with Newton-John in Melbourne, where she said the two dueted on "Hopelessly Devoted to You." She called it a "moment I will never forget."

"I first fell in love with Olivia's voice when I was a little girl and heard 'I Honestly Love You,' " said Carey on Instagram. "Songs like 'Magic,' 'Suddenly' and 'Have You Never Been Mellow' showcased her beautiful airy tone and signature sound. And THEN there was GREASE. I was obsessed. I dressed up as Bad Sandy for Halloween in 5th grade and thought I was everything."

She added, "I was also blessed to be in her presence on many other occasions and she was one of the kindest, most generous and lovely people I've ever met. She will be missed. She will be remembered. She will be loved. Olivia, I honestly love you."