OMG IMMORTALS!! Spoiler Alert

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I think that was her real body, man, she's gorgeous.

Of course it was a double. Otherwise they wouldn't do those kinds of cuts.

idk but you got the three B's, Butt, Boob, and Bush woot woot

You will all taste oblivion... Which tastes like Red Bull.... Which is disgusting!

I think it was her and her body was just amazing, her ass exceptional, we lost our breath.

Thanks for ruining it, jerk.

Confirmation:
http://www.msnbc.msn.com/id/45223634/ns/local_news-orange_county_ca/t/freida-pinto-explains-her-nude-scene/

Here's an Ellen interview which she says as much.
http://www.youtube.com/watch?v=v6vXEKsMYgs

Surprised that he never asked her, but I think the director being indian too, would never ask that from an indian actress. Also not too sure about using a superior body as a double, to increase the sex appeal of an actress. Might be a good option in alot of places possibly.