ALICIA KEYS GOOD GENES OR GOOD DOCS?

1/25/2015 12:25 AM PST

Alicia Keys: Good Genes or Good Docs?!

Alicia Keys' beauty is on fire!

Here's a 20-year-old version of the "Fallin'" singer at a Grammys party in Los Angeles back in 2001 (left) and almost 14 years later ... the mother of two -- who is celebrating her 34th birthday today --  at a book release in New York City late last year (right).

She's always on key.

The question is ...