Ok, so, turns out that those photos are exclusive to olivia-w.com (according to them) and were provided by a much smaller (but still pretty big) photo company than companies like WireImage/Getty Images etc. So I pretty much couldn't find them anywhere else.
The closest things I could find were these 2 behind-the-scenes photos from the same photoshoot:
link
&
link
Sorry I couldn't be of more help. Maybe someone else has some inside knowledge that will be more helpful!