Janet Jackson Good Genes or Good Docs?

0523_janet_jackson_good_genesJanet Jackson looks like a billion bucks.

Here's the 17-year-old "Control" singer back in 1983 (left) -- and 30 years later, the 47-year-old "Rhythm Nation" diva at an amfAR event in Cannes this week (right).

Miss Jackson ain't nasty.