'Gossip Girl' Celebrates 100 Episodes

Gossip Girl got a special visitor last week when New York City mayor Michael Bloomberg stopped by the set to commemorate the impact GG's production has had on the local New York economy ... and declare January 26 "Gossip Girl Day!"

Gossip Girl - 100th Episode Photo Preview

The honor was to mark the show's landmark 100th episode, airing tonight at 8 p.m. on The CW, which features Blair's wedding to Louis. Or at least the processional. Whether or not Blair actually says "I Do" is as big a question mark as the show has ever featured.

Watch Three Clips From Tonight's Gossip Girl

So will Blair marry her Prince Louis, or will her dark prince (Chuck Bass) crash the wedding? Tune in tonight and find out!