Are there official self-references in the (new) World of Darkness setting (that is, "in-game")? Does White Wolf exist within their own universe? Are people playing Vampire: The Masquerade (or The Requiem) or any other WW game in the (n)WoD?
Obviously, as a Storyteller, anyone can bring such a self-reference and/or metareference into the game ("So you met this Storyteller at a Con who turned out to be a real Ravnos!", "I'm going to play a Guardian of the Veil who's always been an rpg geek and is now patrolling the net looking for breaches of secrecy on sites like RPG.SE and such") -- but I'm not looking for unofficial instances. Please, cite official mentions only, be they from rulebooks, comics, novels, computer games... whatever published officially by White Wolf. :)
(For bonus points, mention famous WoD "inspirers" as well, such as Anne Rice, for example. Again, official sources only.)