Is Leighton's bag a new D-bag? It has the long shoulder strap like the very first D-bag. Then the D-bags from recent years did away with the shoulder strap.
Yes, based on comments from one of my SAs, I believe her bag is the new D-Styling Due Mancini, available in media and grande. Another new fall style is the D-Styling––has a bit more of a bauletto shape. Also comes in two sizes.