WASHINGTON, D.C. (AP).- For 16-year-old Princess Lawrence, it was dizzying to be one of 15 high school students invited to the White House as Michelle Obama honored the winners of the National Design Awards. In a few heady hours Tuesday, Lawrence got to meet the director behind Kanye West’s music videos, fashion designer Gilles Mendel and other top innovators in the worlds of architecture, graphics and computing. Those hours spent rubbing elbows with the first lady and leading U.S. designers had Lawrence giddy amid the White House whirl, asking herself repeatedly: “Is this real?” For a day, Lawrence and fellow teens tasted Washington’s fast-paced networking as artists, film directors and designers converged for an East Room luncheon. There, Lawrence was in the midst of the VIPs, introducing