Pictures of Britney Spears' ass: Take 12.

Yes, fans, the bad moon has risen once again.

Britney Spears reveals her ample backside in these mostly naked pics, taken months ago on one of her wild nights in New York, but only surfacing as of this week.

Taken just five days prior to the star's now infamous head shaving incident in February, Britney leaves little to the imagination in these pics, where the singer poses with pals and a tiny thong.

At least (or too bad) she wasn't wearing no underwear.

Partying at the Club One in New York, the troubled 25-year-old went backstage to chat with the club's dancers and ended up stripping down to nothing in the process.

Spears' erratic behavior has been a constant source of entertainment for lucky celebrity gossip purveyors and a cause for concern among those close to her, such as ex-husband, Kevin Federline.

She sure seems like her usual wasted, out-of-it self in these pics.

In any case, Britney Spears certainly seems content to have her picture taken with these two dancers, one of whom sports a thong even tinier than her own. Gross.

Less than a week later, she shocked the world at a tattoo parlor in San Fernando, Calif., when she took a set of clippers to her dome and sheared her locks clean off.

A bald Britney then raged against the machine of celebrity news with an umbrella and checked into rehab later that month. And so on, and so forth.

Rarely does a day go by where we don't see Britney Spears naked or close to it. While many guys would undoubtedly love to go all J.R. Rotem on that rear end of hers, you gotta admit that the girl needs serious help. Here's hoping she goes to rehab again and finds it.