Britney Spears may have finally made a good decision. The train wreck, who hasn't done much publicity for her new album, "Blackout," besides her daily run to Starbucks to get photographed, has pulled the plug on a potential Rolling Stone cover, said an insider. Spears was close to signing a contract with editor and publisher Jann Wenner, to pose for the cover, but called off talks when the Wenner Media boss refused to promise her it would actually land on Rolling Stone instead of Us Weekly, said the insider. Last year, Nick Lachey was duped into believing Wenner's promise of a Rolling Stone cover and was furious when he landed on Us instead. "It was going to be a good platform for her music to be taken seriously because it had been so long. But she refused to get screwed by Wenner," said our source. "They kept negotiating, and it got nasty." Spears has contacted Blender magazine, and a deal is being worked out for a cover there, said the source. A rep for Rolling Stone said they were "exploring a cover" but never had a discussion about any kind of contract.