Morris Chestnut -- Good Genes Or Good Docs?

Morris Chestnut's good looks are a tough nut to crack!

Here’s a 23-year-old version of the sexy actor suited up at a premiere party in Hollywood back in 1992 (left) and 23 years later … the 46-year-old 'Best Man' on the red carpet in Beverly Hills earlier this year (right).

The question is ...