Paris Hilton, who hasn't done anything scintillating lately, is back with Carl's Jr. for another unlikely pairing of patties, pickles and puerile car washing. A new ad from 72andsunny has her advising Sports Illustrated model Hannah Ferguson on how to best clean a vehicle. Hilton is also doing things orally with a hamburger that don't seem really to involve eating. The soundtrack: Cole Porter's "I Love Paris."