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Jennifer Aniston is co-starring in the new Heidi Montag movie, Just Go With It, and we just snapped these exclusive pix of her on set at Barneys New York in Bev Hills!

But what's with Jen looking all geeky and drab? I thought her hair was supposed to be effortlessly shiny and flowy in all her movies! And that outfit does nothing for her figure.

Don't tell me Heidi is supposed to be the hot one in the movie! Ugh.