like the valiant little trooper she was on the movie set , meryl smiled politely at the speechless group , made a pretty apology to matt for interrupting him , then turned and walked out with all the modest dignity of a pinafore-clad student in a girls ' convent school-which was a true tribute to her acting skills , since the little red g-string and the cheeks of her fanny were clearly visible beneath the fiery red negligee draping her lithesome body .