Michelle Trachtenberg: Halloween 2033 Party Girl

Looking absolutely adorable, Michelle Trachtenberg attended the Halloween 2033: Adult Playground Event Series at 1Oak in New York City on Saturday night (October 31).

In a dazzling Victorian costume, the "Mercy" actress mingled and posed for pictures alongside Scott Sartiano at the party, which also drew out Michelle's "Gossip Girl" mates, Penn Badgley and Blake Lively.

Meanwhile, you can catch Miss Trachtenberg in her latest endeavor, "Mercy," which airs its next episode on Wednesday, November 4th at 8/7C on NBC.

Seeing Elisabeth Moss, Stiller and Meara as guest stars, the episode titled "The Last Thing I Said Was..." sees "Veronica come clean with Mike as a cancer patient fights treatment."

Celebrity Gossip

Enjoy the pictures of Michelle Trachtenberg taking part in the Halloween festivities (October 31).