There's that old joke about diarrhea being hereditary (it runs in the jeans); apparently the same theory holds for the Spears family's passion for cheese. The man who sired Britney (aka Jamie Spears) reveals as much to an inquiring Joel, a fact backed up by a special appearance by, wait, is it really the Louisiana cheddar hound? Check it all out on a new Soup tonight at 10:00 ET/PT.