Bar Refaeli VERY DIRTY PHOTO

8/10/2011 6:30 AM PDT

Bar Refaeli Bikini -- Very Dirty Photo

Professional bikini model Bar Refaeli rolled around in the mud at the Dead Sea in Israel ... and it was good.

Bar posted the pics on her Twitter page this morning ... saying, "*muddy* but feels good!! DEAD SEA - if you haven't been... well, sucks for you!"