A new song has leaked online, which is reportedly a JUSTIN BIEBER track called "Yellow Raincoat".  If this is true, it'll be on Justin's new album, "Believe Acoustic", which comes out Tuesday.

--There IS a track called "Yellow Raincoat" on "Believe Acoustic" . . . but Justin's rep won't confirm that this is it.  And last night, Justin merely Tweeted, quote, "I love music.  Just had to say that."