We all know about
GuysWithiPhones by now, yes? (Note, LINK IS DEFINITELY NOT SAFE FOR WORK, though there is at least a non-zero chance there will be no actual visible cock on the front page at any given moment.)
There's even a modest list of GWiP-lebrities who've posted (generally non-nude) pics of themselves! There's
Chris Rock Lil Duval* in a bathrobe, apparently-
Ashton Kutcher, Andy the
drummer from Fall Out Boy, and... wait,
who's this? ...oh. Ohhhh. Oh me oh my...
*[edit: try and tell me that pic doesn't look like Chris at a glance!]