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T.I. and Tiny's little girl, Heiress Harris, is launching her music career with a bang-up cover of Rihanna's 'Black Panther' anthem "Lift Me Up" ... and Mom and Dad gotta be proud!!!

Heiress -- who's only 6 years old, btw -- dropped her rendition Thursday on IG ... and instantly earned some rave reviews from fans in the comment section.

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