SPOILERS AHEAD!

Leighton Meester makes a run for it as she films new scenes for Gossip Girl in New York City on Monday evening (November 14).

The 25-year-old actress wore a gorgeous Vera Wang Spring 2012 gown for the turning point in Blair Waldorf’s storyline.

For the 100th episode, Blair (Meester) is finally tying the knot with her Prince, Louis Grimaldi (Hugo Becker).

According to exec producer Josh Safran (via TVLine), “The big event in the 100th episode is Blair’s wedding. [The vows will be] big and lavish and twisty and juicy. [There are] a lot of callbacks and echoes to the pilot. It was important for me to pay homage and respect [to our first episode]. There are a lot of Easter eggs. I think it’s going to be really beautiful.”

15+ pics inside…