Mariah Carey: ~ $40 Million, Gulfstream
Mariah Carey is a world-known singer and songwriter, famous for her vocal range of five octaves and her trademark whistle register, which is the highest range possible for a human voice. This earned Mariah an entry in the Guinness Book of World Records and enabled her to achieve great success during her now thirty-year-long career. She has released fifteen studio albums so far, and the latest one was in 2018, Caution, which possibly received the highest praise out of all others. Mariah owns a Gulfstream private plane, which is estimated at $40M.