Calvin Klein was more focused on scoping out up-and-coming talent than on troubled on/off boyfriend Nick Gruber at the Pratt Institute fashion show Thursday. Klein introduced Fern Mallis, who accepted a lifetime achievement award from the school. Klein sat in the front row as 17 Pratt seniors showed their collections, and his face perked up when student designer Elizabeth Ammerman took her bow on the runway wearing an adventurous oversize purple fur jacket.