Katy Perry -- Good Genes Or Good Docs?!

Katy Perry's looks over the years have shined bright like a "Firework!"

Here is a 26-year-old version of the bedazzled babe standing tall and having a ball during the "VH1 Divas Salute The Troops" in Miramar, California back in 2010 (left). This was around the same year she dropped her mega-hit song "Firework."

And, 13 years later the hot momma recently ignited her explosive voice -- looking like no time has passed for the pop icon -- during the U.K.'s Coronation concert at Windsor Castle (right).

"Cause baby, you're a firework!"

Mrs. Perry has definitely "bloomed" into a beautiful star, but the question is ...