Christina Aguilera has revealed the secret behind hers and Jordan Bratman's successful marriage - baking in the buff!

The peroxide-haired diva told US talk show host Ellen DeGeneres, "We claim ourselves to be the cosiest couple ever. We have something called 'naked Sundays.'"

She added, You have to keep marriage alive, spice it up. (On Sundays) we do everything naked. We cook naked."

A spluttering DeGeneres then asked the one-time 'Dirrty' diva, "Nothing with grease - that could splatter?" to which Aggy replied, "Well, unless you want the grease."

Cheeky...

'SLJ'
'08/02/07'