http://www.vanityfair.com/hollywood/...iversary-photo
It's clear a lot of post-processing went into this, either a ridiculously well straightened wide-angle shot, or several small angle shots all "panorama"d together.
The stars present are insistent that they were all there and that "it is not photoshopped".
I'd argue it simply has to have been "photoshopped" to get all the lines straight (especially without distorting any people), right?