Blair Waldorf is getting married on Gossip Girl.

The groom-to-be is ... Prince Louis of Monaco.

The date will be the CW show's 100th episode.

Executive producer Josh Safran confirms that this Gossip Girl milestone, set for early next year, will “big and lavish and twisty and juicy.” It will also pay homage to the four and a half seasons of the series.

Longtime fans can look forward to “a lot of callbacks and echoes to the pilot," says Safran, who promises "Easter eggs" (hidden treasures that turn up unexpectedly). One of which is Michelle Trachtenberg.

It's unclear what role Georgina will play in the episode, but expect Serena to play nearly as big a role as the young woman getting married, because from day one, the show's been about these BFFs.

“The central relationship has always been the two of them,” says Safran. “Blair’s getting married and her best friend is her maid of honor - that’s a core dynamic we’re always playing with.”

As for the much-anticipated kiss that awaits Blair?

It will be followed by a slap. That's all we've got.

Still no word on who's planting it on our girl, but that kiss goes down in the November 14 episode, "The Big Sleep No More." Who do you think kisses her, and what will the repercussions be?

Sound off on the kiss, the wedding and all things Gossip Girl below!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.