Stripped Down in
Secret Fashion Shoot
OK, now to the facts -- It was all part of Marc Ecko's secret "Muse" campaign directed by Markus Klinko and Indrani -- a secret he's had to keep under wraps for several months ... hence the mask.
TMZ has learned Lindsay posed for the shoot back in May -- right around the time she was getting into trouble with Judge Marsha Revel.
We're told Marc chose Lindsay because he wanted someone "whom fascinated us -- for better or worse."
Well, mission accomplished.