"We claim ourselves to be the coziest couple ever. We have something called 'naked Sundays,"' the 26-year-old pop star tells Ellen DeGeneres in an interview set to air Wednesday on "The Ellen DeGeneres Show."
"You have to keep marriage alive, spice it up," says Aguilera, who married Bratman in November 2005.
So the couple stays in on Sundays, she said. "We do everything naked. We cook naked."
"You cook naked?" asks DeGeneres.
Aguilera replies: "Yeah, we cook naked."
"Nothing with grease — that could splatter," said DeGeneres.
"Well, unless you want the grease," Aguilera replied.