New York Post Online Edition: gossip: "THE Olsen twins are copying the Hilton sisters in their efforts to differentiate themselves. Just as Nicky Hilton dyed her hair brown to contrast with platinum Paris, Mary-Kate has dyed her hair bright red, while Ashley's tresses look lighter then ever. But both of their eating habits are raising eyebrows. Ashley was at Nobu Next Door the other night and 'barely ate a thing,' said one spy. Both thin twins are notable lettuce-eaters."