Christina Applegate GOOD GENES OR GOOD DOCS?

11/30/2014 12:05 AM PST

Christina Applegate: Good Genes or Good Docs?!

Christina Applegate is still a Bundy beauty.

Here's a 17-year-old version of the "Married With Children" star at a children's event back in 1988 (left) and 26 years later... the "Anchorman" actress -- who celebrated her 43rd birthday last week -- in San Diego last summer.

"Take me to pleasure town."

The question is...