Here are the producers who have been officially confirmed to be either writing or producing Britney’s new album.  I have also included a list of rumoured producers underneath.  If they have worked with Britney previously, the song titles are next to the names.

Confirmed:

Bloodshy & Avant (”Toxic”, “Piece Of Me”, “Do Somethin’”)
Keri Hilson (”Gimme More”, “Break The Ice”, “Perfect Lover”, “Outta This World”)
Sean Garrett (”Toy Soldier”)
JR Rotem (”Everybody”)
Guy Sigworth (”Everytime”, “Someday (I Will Understand)”, “Over To You”)
Danja (”Gimme More,” “Break The Ice”, “Get Back”, “Perfect Lover”, “Outta This World”)
Jim Beanz (”Gimme More,” “Break The Ice”)
Kara Dioguardi (”Heaven On Earth”, “Brave New Girl”)
Darkchild (”Overprotected” Remix, “I Love Rock ‘N’ Roll”, “Intimidated”)
Dallas Austin
Fredwreck
Taio Cruz
Lady GaGa

Rumoured:

Cathy Dennis (”Toxic”, “Showdown”)
Bryan-Michael Cox
Babyface
Polow Da Don
Damon Elliott
The Runawayz