''Here I am as a very small sheriff,'' says this NBC star and song-and-dance man of his 5-year-old costume. ''I remember really loving that vest and, clearly, I was very pleased with my mustache. And that is still the smile I use today for all formal occasions.''
Click to next screen to see who this is.
Stars from ''Vampire Diaries,'' ''30 Rock,'' ''Jersey Shore,'' and more raid the family photo album to show us their childhood get-ups. Can you guess who's who?