It took years of searching for Monroe to track down the white piano belonging to her mother, Gladys. After her mother, who was a paranoid schizophrenic, was institutionalized, most of the family’s belongings were sold, including the sentimental piano. “My happiest hours as a little girl were around that piano,” the actress once said, according to The New York Times. “Even when I didn’t have enough money to eat, I borrowed money to keep that piano in storage.” In 1999, Mariah Carey purchased this piano from Christie’s for $662,500. “I had to fight for it,” Carey told Playboy of the piano in 2007. “I know it was expensive, but it was important to me. It's in my will that if anything should happen to me, the piano goes to a museum, which is where I think it should have gone in the first place.” Carey even recently named her baby Monroe after the late actress.