But Stone's entry into "Spider-Man" threw those plans in flux, and now MTV News has heard from Stone herself that she won't be taking part in "Jump Street."
"I don't think I'm going to be part of that, but Jonah is one of my favorite people in the entire world," she told us during a chat for our Thankful Week (we named her the actress we're most thankful for in 2010).
As recently as early November, Hill was still playing coy about casting Stone. "I can't say anything to the negative or the positive of that," he told us of the possibility. "I think we'll have some cool casting announcements to make very, very soon."
Instead of an announcement about Stone, though, news soon broke that Channing Tatum had signed on to "Jump Street." And when we asked Stone if she still had plans for the flick despite her commitment to "Spider-Man," she joked, "I think Channing Tatum swept in."
So while she won't be stepping in front of the camera with Hill and Tatum on the project, she told us she can't wait to check it out. "I'm psyched to see that movie," she said. "It's going to be great."
Are you disappointed that Stone won't be in "21 Jump Street"?