I just watched the vid (well that section, and watched it frame by frame and brightened it up) and it looks like it is Kreuk
Granted it's shot from the back, but you can catch the side of the face and it looks just like Kreuk.
Yes, she refused to do the infamous nicodemus scene, however, you have to remember that was when she was much younger and had different views (and seemed a lot more shy). Plus the smallville scene was gratuitous in nature, it was meant to titillate a teenage viewer ship and had no significant meaning or importance to any story and also it showed a heck of lot more in those nice tiny red lacy underwear
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Since then she's also done the Arena stuff and also mentioned in interviews how peoples views change and they don't remain the same. So i wouldn't be surprised if she found this scene to be artistic and important to show the love the two characters feel for each other. Also, it wasn't really a nude scene, it was just her back you saw, although you can see side -boob, her nipples were probably covered
Ok, i'm getting a little graphic now....i think i need a cold shower.
I thought she did a great job
