Christina's shoe fetish.

SKECHERS MAY BE giving Birkenstocks a run for their money in the lesbian market, judging by an ongoing supersapphic series of salacious print ads featuring Christina Aguilera. Dubbed "Naughty and Nice," the campaign has Aguilera playing dual roles in each ad: naughty nurse with frazzled patient, yardstick-wielding schoolteacher with cheeky schoolgirl, and very bad cop with assuredly guilty detainee.

"I agreed to be part of Skechers' international marketing team because I like its image--youthful but edgy," Aguilera, too busy to talk to The Buzz, has said. But we like to think that at least some of these saucy she-on-she scenarios are born from Aguilera's own fantasies. She's always known how to clean up by playing "Dirrty."