Pete Davidson -- Good Genes Or Good Docs?!

Pete Davidson's looks over the years have made quite the 'transformation!'

Here is a younger 17-year-old version of the "Bupkis" star when he'd just begun his comedy journey ... already thriving on stage at a comedy club back in 2011 (left). This was just a few years prior to him scoring big on "Saturday Night Live."

And, 12 years later the comedian-turned-actor recently brought his charming smile to "The Tonight Show Starring Jimmy Fallon" just ahead of his next movie premiere, "Transformers: Rise Of Beasts" (right).

It's a fact, some of Hollywood's hottest stars are down for some Pete, but the question here is ...