Taking style tips from big sis? Kendall Jenner dazzles in a backless silver gown in new modelling shootBy Andrea MagrathThe two youngest sisters in the Kardashian-Jenner clan look up to their famous big sisters.And Kendall, 15, is starting to develop a taste for the red carpet style Kim, Kourtney and Khloe are famous for.The teen models in a new photoshoot wearing a backless silver dress similar