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Same girl no? I've gone looking for this girl and I found her on a sort of workout/fitness forum, it wasn't an ID section either it was a specific thread for Laura Michelle Prestin and that pic of yours and the one I posted were there. Also just by looking at her abs in my pic you can tell she's extremely fit. I can understand not wanting it to be the same girl because a quick google search shows her to a bit older and more, how should I say, plastic faced than you would hope for but that is Laura Michelle Prestin. On the bright side there are tons of pics of her. There is a good reason why you may be thinking she is a different girl actually, it's because she evidently has a clone
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The first pic in the second post is a very similar looking girl dressed the exact same, in the exact same pose in a similar looking room. I made a post about it on the third page about how weird it is.