In a sit-down with Ellen DeGeneres airing Wednesday, Christina Aguilera reveals - and boy, is that putting it mildly - that she and hubby-of-a-year Jordan Bratman wind down their weeks with "naked Sundays." "You have to keep marriage alive, spice it up," shares Aguilera. "We do everything naked. We cook naked." Almost assuredly giving new meaning to "grand-slam breakfast."