Watch Gossip Girl Season 1, Episode 13: A Thin Line Between Chuck and Nate – The shadowy and unseen ‘Gossip Girl’ takes pleasure in reporting that Serena was spotted by one of GG’s Web contacts buying pregnancy tests at a local pharmacy.

Watch Gossip Girl Season 1, Episode 12: School Lies – Serena, Blair, Nate, Chuck and their entourage break into the school swimming pool for a night of fun, but when a member of their group nearly drowns, the school threatens to expel the person responsible for the break-in. Everyone agrees to keep a secret pact and say nothing, but it ultimately creates major tension between Serena and Dan, who isn’t sure he’s ready to take the fall for someone else and risk his future. Meanwhile, Vanessa is working on a documentary project about private schools and accidentally captures Blair and Chuck discussing their affair. Also, Lily contemplates telling Rufus how she really feels about him.

Watch Gossip Girl Season 1, Episode 11: Roman Holiday – Blair’s estranged father, Harold, comes home for the Christmas holidays with an unexpected guest: his gay lover Roman. Both Blair and her mother, Eleanor, find it difficult to hide their disappointment while Blair hatches another underhanded plan to get rid of Roman for good. Meanwhile, Jenny and Vanessa help Serena plan the best Christmas surprise ever for Dan, who may have a surprise of his own in mind for Serena. Chuck phones Blair from Europe and informs her that Nate has joined him in Monaco, worrying Blair that Chuck may disclose the details of their hook-up. Also, Rufus refuses to remain the understanding husband any longer after Alison’s former lover calls the house.

Watch Gossip Girl Season 1, Episode 10: Hi, Society – As ‘Gossip Girl’ posts news of the annual Cotillion Ball to take place on the approaching weekend, Blair decides not to go with Nate, but she finds herself being featured in The New York Times and is enjoying her secret affair with Chuck. Serena decides not to go either, so her grandmother, CeCe, shows up to change her mind.

Watch Gossip Girl Season 1, Episode 9: Blair Waldorf Must Pie! – Although it is Thanksgiving, hardly anyone has the holiday spirit. Blair and Serena have a fight once Serena admits that she saw Blair with Chuck, and Blair orders Serena to keep it to herself. Meanwhile, Nate and his family share a strained Thanksgiving meal before Mr. Archibald ends up in the hospital after a suicide attempt.