rebecca exton-russell , 37 , was formally 18 and posed in campaigns for major brands including marks & spencer , qvc and dove .
but the derby-based model was secretly ` repulsed ' by her body , so she checked into a military-style fitness camp and lost just over two stone in two months - going down from 14 stone to just below 12 stone .
rebecca lost a further stone herself after she left no 1 boot camp in norfolk - a reality tv star favourite - dropping to 11 stone .