We now know the date on which Gossip Girl will be signing off for good.

The CW confirmed today a December 17 series finale for the long-running drama, which will bid viewers one final "XOXO" with a just-announced TWO-HOUR episode.

Moreover, in news broken by TV Line, the network will air a special retrospective immediately prior to the installment.

Not a great deal is known about the final Gossip Girl episode, except its title ("I Love You, New York XOXO"); the return of Jenny and Eric; and, oh, right, the possibility that we'll meet Chuck and Blair's son.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.