Lil Wayne wants to spend a night IN PARIS -- at least according to a new unreleased duet with Paris Hilton ... in which Weezy references the most famous sex tape of all time.
TMZ has obtained a copy of the song -- which Paris hopes to feature on an upcoming album -- and it's actually not that bad.
But the clincher -- Weezy raps, "Excuse my french, but f**k the cameras / I wanna spend a night in Paris."
Obviously, he's not talking about the city ... or is he? (He isn't.)