Go to the "Select An Icon" screen and select the following icons in order to activate the corresponding cheat function.
"Ching-a-Ling" by Missy Elliott
Enter Monkey, Cat, Koala, Rabbit as a code.
"Dance Dance" by Fallout Boy
Enter Diamond, Heart, Broken Heart, Cherries as a code.
"Pieces of Me" by Brittney Spears
Enter Flying Star, Spade, Lolipop, Peace Sign as a code.
"Won't Go Home Without You" by Maroon 5
Enter Strawberry, Butterfly, Duck, Fire as a code.