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BREAKING: JOANNA NEWSOM TO REPLACE YEARDLEY SMITH AS VOICE OF LISA SIMPSON?!?!

joanna!!!!!Popular songstress and harpy Joanna Newsom is reportedly appearing in an upcoming Simpsons episode. It’s being described as a “guest appearance,” but I have reason to believe this is merely a smokescreen for the real truth: the producers are secretly bringing in Newsom to replace Yeardley Smith as the voice of Lisa Simpson.

Now, I know what you’re thinking: hey, the Yeardster’s voiced America’s favorite starfish-haired feminist for nearly 25 years! They’re not just going to throw her under the bus! Well, let’s take a look at the evidence:

FACT: Newsom’s voice is often compared to that of Lisa Simpson’s.

FACT: The voice actors are not getting any younger.

Just look at what happened to Frank Welker, who used to voice the dog: the producers discovered Dan Castelleneta could voice the dog just as good, so they gave Frankie the boot. Could history repeat itself again when Newsom comes in to record what she believes is a cameo? Let’s say, hypothetically, a director slides her a script and asks her, just for funsies, to read some of Lisa’s lines. And what if, that night, the producers get together, in secret, and compare her vocal track with Smith’s… and decide Newsom’s is better?

If I were Yeardley Smith, I’d be looking over my shoulder at all times. And I were Joanna Newsom, I’d leave the harp at home, in order to prevent any Nancy Kerrigan-type shenanigans… Developing… [TwentyFourBit ]

UPDATE (10/20/2010): IN THE NEWS has successfully shamed the producers from going through with their plan, and Joanna Newsom’s cameo is definitely not happening. Yeardley Smith, you’re welcome. [Pitchfork]