MTV recently spoke with actress Emma Stone who, besides giving an update on the Untitled Spider-Man Reboot, also revealed that she will not be starring in 21 Jump Street with Jonah Hill. Here's what she told the site:

"I don't think I'm going to be part of that, but Jonah is one of my favorite people in the entire world."
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We reported at the end of September that both the 21 Jump Street and Untitled Spider-Man Reboot productions were seeking Emma Stone for roles. Now that she's locked into playing Gwen Stacy in Spider-Man 2.0, it seems there won't be time for the actress to appear in 21 Jump Street as well.

21 Jump Street will begin production sometime in early 2011, while Untitled Spider-Man Reboot starts shooting in December.