filming dress gossip girl tiara Penn Badgley Leighton Meester
filming dress gossip girl tiara Penn Badgley Leighton Meester

That's one way to keep warm on set!

On a very chilly Monday atop the steps of the Metropolitan Museum of Art in NYC, Leighton Meester and Penn Badgley had the daunting task of having to kiss each other for a scene in an upcoming episode of Gossip Girl -- but we couldn't take our eyes off that glamorous couture gown!

Meester's character, Blair, finally fulfilled her dream of becoming a real-life princess when she tied the knot with Prince Louis in the show's 100th episode. We're guessing she'll end up with Badgley's character in the end, since she ran off with him on her wedding day, but for now, we're loving her new royal wardrobe -- especially that tiara!

Don't hang up the crown just yet, B!