Mariah Carey: Good Genes or Good Docs?

Posted Sep 20th 2009 4:15AM by TMZ Staff

Mariah Carey has hit a high note ... and her voice is really good too.



Here's the 21-year-old diva back in 1991(left) -- and 18 years later, the 39-year-old version at a film premiere in Toronto last week (right).

She really is "Precious."

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