Is it true...

Yes. My sources tell me she'll be playing a major role called "Emily Dickinsnatch".

Also, it turns out the N*Sync WILL appear in Star Wars, Christina Aguilera will be the major villian in Matrix : Reloaded, the Backstreet Boys are confirmed to appear as lords of Gondor in part three of Lord of the Rings, those Hanson boys will be Ash's sidekicks in Evil Dead 4, and Eminem will be playing himself in the remake of Rollerball.