TMZ spoke with the man -- "Eddie" -- who tells us he was just minding his own business in Hollywood when he was approached by a man who offered him money in exchange for saying a few pre-written lines into the camera.

Eddie says the cameraman told him the video was being made for a friend's wedding -- Eddie had no idea it was for Timberlake and Jessica Biel.

When we told him how the footage was used, Eddie told us, "That makes me feel real bad ... that was a trick played on me."

In case you're wondering why Eddie is dressed so nicely in our video -- it's because he was out looking for a job yesterday.