You know what makes a Hump Day great? Chili cheeseburgers — and Rach is serving them up to two famous taste-testers: James Purefoy and Michael K. Williams from "Hap and Leonard: The Two-Bear Mambo!” Plus, Zanna Roberts Rassi and Gretta Monahan square off in an instant outfit challenge. (They’re turning sweaters into strapless dresses, cardigans into backless tops and socks into boots?!) And Tom Walker's in the house to perform his new single "Leave A Light On!"