Lil Jon, Rodney Jerkins, Sean Garrett, and Taio Cruz, announced they were working with Spears, though their tracks are not included on the official track listing.
Potrdila je tudi, da bo album intenzivneje pričela snemati poleti leta 2008, kar so kasneje potrdili tudi producenti Sean Garrett, Danja, Guy Sigsworth in Bloodshy & Avant.