#Diddy’s working hard behind bars ... wrapping up after an honest day’s work in new videos obtained by TMZ. Check out the clips of the music mogul wrapping up his work for the evening on Friday at #FortDix’s media library located in the chapel, where he helps give movies and religious materials to inmates. Diddy, wearing a brown knit cap to cover his gray hair, seems to be readying to stay for awhile ... removing his scarf and blue coat to reveal his gray prison uniform. Later on, he puts the jacket back on and takes his leave. via tmz_tv • nathan.berganza