!! OMG, his butt: Justin Timberlake !!
If you can tell at a glance which of the eight butts after the jump belongs to Justin Timberlake, then your celebrity rump identifiers are better trained than mine. Apparently, the NSFW photo was taken at Timberlake's bachelor party, which must have been a drunken enough afternoon to convince everyone to moon the camera...
Click images to enlarge:
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