Alicia Silverstone GOOD GENES OR GOOD DOCS?

4/19/2014 12:11 AM PDT

Alicia Silverstone: Good Genes or Good Docs?

Alicia Silverstone is still a total betty!

Here's the 18-year-old version of the uber-cute "Clueless" star at a premiere in Los Angeles back in 1994 (left) -- and 20 years later, the now 37-year-old mother and author at a book signing in New York earlier this month (right).

Like, the question is...