Can you believe GWEN STEFANI didn't even know BLAKE SHELTON existed until she met him on "The Voice"?! She says, quote, "I didn't even know that he was a human being on this planet." Obviously, Gwen and Blake came from two different worlds, musically and otherwise.  But they've had years to get used to that.  "I've accepted that he's a true hillbilly and all those things.  I just love that we're from different genres." (This is from Andy Cohen's Sirius radio show.  You can listen here.)   (If you haven't seen it yet, check out a Scranton Branch video that "The Voice" posted yesterday.) [...]