So Lady Gaga and Terry Richardson are doing an artsy photo book together. It was only a matter of time, and it makes utter and perfect sense. The two have done some messed up things together (like that editorial he shot, at left, for the May 2011 issue of Harper’s Bazaar.

It feels like an appropriate time to take a look back at Gaga’s most provocative photos: the headpieces, the editorials, the stage antics, the frequent nip slips.

Click through, if you dare.