Blair Waldorf is gorgeous and is the teen queen of her high school... but many problems lie beneath that perfect exterior.
And Mrs. van der Woodsen is not entirely pleased at what she hears as Rufus and Allison have unknowingly invited her to an awkward Thanksgiving.
Dan Humphrey and his mother have a heart to heart after some very interesting family gossip becomes known.
Serena van der Woodsen (Blake Lively) is all smiles in this still photo from "Blair Waldorf Must Pie!" The episode aired originally on November 28, 2007.

Gossip Girl Season 1 Episode 9 Quotes

Serena: What's Chuck doing today?
Blair: Why are you asking me?
Serena: Well, you guys are friends. And, Blair, you know you can tell me anything. I'd be the last person to judge anyone.
Blair: With good reason.
Serena: Blair, I saw you with Chuck.
Blair: [pauses] I don't know what I was thinking. I mean, sleeping with him once, maybe I could understand. But twice?
Serena: Wait, you slept with him!?
Blair: Shhh.
Serena: Blair!

Serena: You and Nate get back together?
Blair: You mean, since Gossip Girl published pictures of him and some skank?