Brace yourselves, Upper East Siders, and prepare to drool over the wedding dress you’ve been waiting FORever to see. No, we don't mean Kate Middleton, Kate Moss or even Bella Swan's. We are, of course, talking about Blair Waldorf's bridal fancy. LOOK:

Disney Princess or what? Leighton Meester was on set in New York last night filming the moment when her Gossip Girl character gets hitched to a French Prince. The show’s executive producer, Josh Safran, has reportedly said the highly-antcipated wedding will be 'big and lavish and twisty and juicy', naturally. So, as you’d expect, Blair’s dress is suitably fairytale-esque – full-skirted, brilliantly frothy and with a chiffon bow at the waist plus a ginormous train.

Although it hasn't been confirmed, we're guessing the dress comes courtesy of Vera Wang – just like Kim Kardashian's – seeing as Leighton is the face of the designer's perfume and, of course, Ms Waldorf isn't short of a few pennies. The dress is topped off with white peep-toe heels, a sparkling necklace and a tiara to match, poised amongst Blair's glossy brunette waves. Isn't she a dead ringer for our K-Middy?

But it looks like this Royal Wedding doesn’t go quite so smoothly. In Runaway Bride style, Blair is seen grabbing her gown and running across the street to jump into a waiting car. What drama!

So what could this MEAN? Has Taylor Momsen sabotaged the wedding with an army of raccoon-eyed goths? Has Liz Hurley used her feminine wiles to steal the hubby-to-be? Can Blake Lively not stand to be upstaged? Or, most probably, Blair has seen the error of ways and is racing over to Chuck’s pad pronto.

Ah, you know you love it…XOXO.