At the Press Start screen enter the following:

Tips and Tricks Shirt for Ishani
     R3, Square, Square, Down, Circle, L3, Square, Square, Up, Left.

PSM Shirt for DeVron
     Left, Right, Left, L3, R3, Down, Up, Up, Circle, Square.

Play Magazine Shirt for Naoko
     Up, R3, Up, Down, Right, Right, Left, L3, Circle, Square.

Official U.S. PlayStation Magazine Shirt for Gibson
     Down, L3, Up, Up, Left, Right, Down, R3, Circle, Square.

IGN Shirt Raphael
     Up, R3, Right, L3, L3, Up, Left, Up, Square, Circle.

GameSpy Shirt for Dwayne
     Down, R3, Circle, L3, R3, Down, L3, Square, Circle, Square.

G4 Shirt for Kazz
     Up, Up, L3, Down, Left, Right, R3, Right, Circle, Square.

Electronic Gaming Monthly Shirt for Dwayne
     Down, R3, Right, L3, R3, Down, L3, Left, Circle, Up.

1UP Shirt for Dwayne
     R3, Circle, Square, R3, Down, Right, Left, Up, Square, Circle.

Unlocks new GMR outfit for Aneeka
     Right, Left, R3, Left, Up, Up, L3, Down, Circle, Square

Unlock GameStar t-shirt
     Up, R3, Right, R3, R3, Left, R3, Down, circle, circle

Unlock GamePro t-shirt
     Down, R3, Up, R3, L3, Down, L3, Up, Down, Square

Unlocks Harmonix Outfit for Ishani
     L3, Circle, Up, Circle, Square, L3, Down, Down, R3

Unlocks Game Informer Outfit for Angela
     Down, L3, L3, R3, R3, Circle, Right, Square, L3, R3

Unlocks Konami Outfit for Dwyane
     Right, R3, Right, R3, Square, Right, Circle, Square, Down, Left

Big Head Character
     Down, Down, Down, Up, R1, L2, L1, R2, Circle, Circle

Glass Character
     Square, Square, Circle, R2, R2, L2, Down, Left, Left, Up

Oil Slick Character
     L2, R2, L2, R2, Square, Down, Circle, Up, Left, Right

T2 Character
     Circle, L1, R2, Up, Up, Left, Left, Square, Square, R1

Wraith Character
     R2, Left, R1, Right, Up, Up, Square, Circle, Down, L2

Tough Crowd Audio Cheat
     Right, Up, Circle, Circle, Circle, R2, R1, R1, L2, Down

Pirate Crowd
     Square, Square, Left, Left, R2, L1, R2, R1, Circle, L2

Robot Crowd
     Circle, Circle, Left, Left, R2, R1, R1, R2, Circle, R2

Zombie Crowd
     Left, L1, L2, Square, Square, L2, L2, L1, Left, Left

Animation Gender Swap
     Up, Down, Left, Right, L1, R1, Square, Circle, R2, R2

Unlock All Songs
     Square, Triangle, Down, Left, Up, Right, L2, R2, Start

Unlock All Venues
     Square, Triangle, Right, Up, Left, Down, R2, L2, Start

Unlock All Outfits
     Up, Circle, Left, Square, Square, Down, Circle, Right, R3, L3

Unlock All Characters
     Up, Square, Right, Circle, Square, Left, Circle, Up, L3, R3

Unlock DeVrons PSM Outfir
     Left, Right, Left, L3, R3, Down, Up, Up, Circle, Square

Toothbrush Microphone
     R1, L1, R2, L2, Right, Left, Down, Up, Circle, Square

Banana Microphone
     L1, L1, R2, R2, Right, Down, Circle, Left, Up, Square

Big Eye Character
     Square, Square, Square, Square, Circle, Down, Down, R2, L2, R1

Small Head Character
     Right, Right, Up, Up, L2, L2, R2, R1, L1

Dwayne Doll Microphone
     Circle, R2, Square, L1, R1, L2, Square, Up, Circle, Square