Updated List Of Confirmed Album Producers/Writers

Confirmed:

Bloodshy & Avant (”Toxic”, “Piece Of Me”, “Do Somethin’”)
Damon Elliot
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”)
Junkie XL (”And Then We Kiss” Junkie XL Remix)
Nicole Morier (”Heaven On Earth”)
Harvey Mason / The Underdogs
Dallas Austin
Fredwreck
Taio Cruz
Lady GaGa
Pharrell Williams
Fernando Garibay (Working on 2 new tracks, “Amnesia” and “Quicksand“)

Rumoured:

Cathy Dennis (”Toxic”, “Showdown”)
Justin Timberlake (”What It’s Like To Be Me”)
Bryan-Michael Cox
Babyface
Polow Da Don
The Runawayz
Timbaland

Source: Britney Spy