Kanye West finally decided to address Ray J — and last night he blasted his lady’s sex tape partner on national TV. West made a surprise appearance on “Late Night with Jimmy Fallon” to perform his hit “Bound 2″ — but during the song, he changed some of the lyrics to attack Ray: “Brandy’s little sister lame man he know it now … When a real brother hold you down, you ‘sposed to drown.” We’re guessing Kanye is finally responding to Ray’s song, “I Hit It First” … in which Ray bragged about bangin’ Kim Kardashian before Kanye did.