Blake Lively and Penn Badgley: Halloween Lovers

Getting into the Halloween spirit, Blake Lively and Penn Badgley were in costume at the Halloween 2033: Adult Playground Event Series at 1Oak in New York City on Saturday (October 31).

For the night’s party, Miss Lively looked sexy as she dressed up as a flight attendant while Penn threw together a last-minute look including a curly wig, headband and casual gear.

Meanwhile, you can catch Blake and Penn in an all-new “Gossip Girl” episode titled “The Grandfather: Part II” airing on Monday at 9/8C on The CW.

A synopsis via the show’s Web site tells: “Olivia (guest star Hilary Duff) says something she regrets during her appearance on Jimmy Fallon’s (Fallon playing himself) talkshow and tries to keep Dan (Penn Badgley) from finding out. With election day around the corner, Nate (Chace Crawford) suspects his grandfather (guest star James Naughton) will stop at nothing to get Trip (guest star Aaron Tveit) elected to congress. In the midst of another feud with Serena (Blake Lively), Blair (Leighton Meester) befriends a new “it” girl and takes her to an election night party at Chuck’s (Ed Westwick) hotel, hoping to make Serena jealous.”