Christina Aguilera and her husband Jordan Bratman spice up their year-long marriage by cooking up Sunday roasts in the nude. The saucy superstar insists she and her man are the "coziest couple ever" and they get sexy once a week for "naked Sundays." She tells US TV host Ellen Degeneres, "You have to keep marriage alive, spice it up... (On Sundays) we do everything naked. We cook naked."