'Simpsons' Creator Matt Groening Says Everyone's Signed On But We Know Differently

5/10/2015 10:02 AM PDT BY TMZ STAFF

"Simpsons" creator Matt Groening took issue with our story that there's a major holdout in the cast, but we know it's true, and now we know who.

Groening told our photog Saturday night all the actors have signed on for the next 2 seasons.  Fox has already announced the renewal.

But sources intimately familiar with the production tell us Harry Shearer, who voices multiple characters on the show, has not re-resigned.  As we reported, all members of the cast make the same amount per episode, but we're told Shearer still has issues with back-end and merchandising and Fox does not have his signature.

Shearer's people will neither confirm nor deny our story, but we know it's true.