tisci in at dior?gossip is that riccardo tisci, who currently heads up givenchy, will be taking over at christian dior. at this point everyone is twittering and hinting but it all started when derek blasberg tweeted the confirmation while backstage at a katy perry concert. i was just told backstage at the @KatyPerry concert (of all places!) that riccardo tisci is CONFIRMED at dior. i leave #PFW for a second... - @derekblasberg