Christina Aguilera on Piercing

Nothing improves Christina Aguilera's mood quite like being pierced.

The pop diva tells Rolling Stone that if she's "having a bad day," she likes to get a new piercing. The mag counts 11 visible shards of metal in her body - including five in her ears and one each in her nose, lower lip and right nipple.

And where are the others?

Aguilera confesses that she has a diamond-studded "ornament" known only to her doctor and selected boyfriends. "It's really beautiful and expensive, and I like it a lot," the Grammy-winner says.

Two places she will never have done: her navel ("too played out") and her tongue ("very sorority").

All this piercing obviously hasn't drained her budget.

The entertainer just paid $2.75 million for a three-bedroom mansion in Beverly Hills.