Blair Waldorf (Leighton Meester) is set to tie the knot with a real prince on "Gossip Girl" -- and her dress is worthy of a royal wedding. Warning: Spoilers Ahead!

Meester was spotted filming scenes for the wedding episode of the CW show last night, where she was seen booking it through the streets of NYC while wearing an absolutely gorgeous gown and tiara.

Could we have a runaway bride on our hands?

See what happens when the wedding episode, also the show's 100th episode, airs January 30.