Episode 3: The Lost Boy -

Chuck and Blair are officially a couple, but let’s be real: they aren't exactly the "white picket fence" type. To keep the spark alive, they decide to engage in a little competitive foreplay at a Sotheby’s auction. The prize? A portrait that both apparently need.

: Even when losing his mind over an auction, he never loses his fashion sense —though those shiny white shoes were a choice. Episode 3: The Lost Boy

The Lost Boy: Sotheby’s, Secrets, and a Scott Rosson Reveal Chuck and Blair are officially a couple, but

Serena is still trying to prove her independence, and what better way to do that than by hanging out with the Upper East Side’s resident bad boy, Carter Baizen? For their meet-up, Serena ditched the prep for a boho-chic ensemble featuring a Matthew Williamson vest and some killer lace-up heels . A portrait that both apparently need

The heart of the episode—and the source of its title—is the mystery of Scott Rosson. Vanessa finally pieces it together: Scott isn't just some guy from NYU; he’s the biological son of Lily and Rufus.

But it’s not all fashion and flirtation. Carter has a secret past with Bree Buckley’s family (yes, the Buckleys), and the "hunt" is officially on. The "Lost Boy" Unmasked

The emotional climax where Vanessa watches Scott lie to his parents is a total tear-jerker. Whether you’re a fan of Vanessa or not, her role in this secret is setting up a massive explosion for the Humphrey-van der Woodsen clan. Spotted: Our Favorite Looks : A Joie top paired with a Rag & Bone skirt. Blair : Pure "preppy chic" elegance at the auction.