R. Kelly Makes Paid Club Appearance, Performs 'Bump N' Grind'

[[tmz:video id="1_vgxnw2fb"]] 12:23 PM PT -- Turns out, R. Kelly DID perform Saturday night during his paid club appearance in Springfield, Illinois. He briefly sang the opening line to his hit "Bump N' Grind" to a very accepting crowd ... which we're…