Former "Teen Mom" Star Shopping Porn Originally Intended for Personal Use

Said she wanted a record of her body at 21

Farrah Abraham is finally copping to shooting a full-on porn -- with A-list porn star James Deen -- but says even though it was intended for her personal scrapbook … she's willing to sell it for $2 million.

 The ex-"Teen Mom" star's reason for shooting the XXX video is simply the best … telling TMZ she wanted to immortalize her smokin' hot 21-year-old body -- for her personal collection -- so she could look back on it when she's old.