Celebrity participants include singer/actress Jessica Simpson working at a computer repair store, supermodel Heidi Klum ("Project Runway") working the counter at a pizza shop, Jeff Probst (Emmy Award-winning host of CBS's "SURVIVOR") running a cashier at a grocery store, Ice-T ("Law & Order: Special Victims Unit") posing as an athletic shoe salesman, Grammy Award winner LeAnn Rimes taking food orders at a Nashville diner and Mario Lopez (host of "Extra") selling hot dogs from a vending stand in New York's Central Park.