Naomi Watts -- Good Genes or Good Docs?

Naomi Watts's good looks belong on the big screen!

Here's a 29-year-old version of the "King Kong" actress, showing off her beautiful bob at a movie premiere in California back in 1998 (left) and 21 years later ... The darling mother-of-two -- who recently celebrated her 50th birthday - at a fashion event in New York City earlier this month (right).

That's Watts up!

The question is ...