Beverly D'Angelo GOOD GENES OR GOOD DOCS?

12/27/2015 7:05 AM PST

Beverly D'Angelo: Good Genes or Good Docs?!

Beverly D'Angelo's beauty has never taken a vacation.

Here's a 34-year-old version of the "Christmas Vacation" babe at a film premiere in Los Angeles back in 1985 (left) and 30 years later ... the 64-year-old Christmas movie MILF looking angelic earlier this year (right).

Christmas miracle.

The question is ...