Its 100% definately photoshopped
I have to say it's very well done though! The one bit they couldnt quite edit is the two hamsters holding paws so ones paw is just overlapping the other rather than them holding paws. Not to mention hamsters couldnt support each others weight like that (especially without eating each other) and im not sure they'd be giving each other flowers.
EDIT: not to mention that the three images are all of the same hamster
i didnt notice that first time round.
Beautiful image, seems a shame to critisize it so lets just stick with nice image and not mention the flaws