Uncovering ~ Cover Couples

This is my version of a cover meme - book covers are fast becoming my favourite part of a book, aside from the actual book itself, and I've been wanting to do a cover meme for a while, so here it is! 
It will vary from week to week (or whenever I get round to doing it), but this week it's COVER COUPLES - something I recently noticed thanks to Goodreads is that covers sometimes look extremely familiar because they use the same stock photo, like:

or

or

Very interesting stuff - I wasn't aware of this before now!