MONDAY, NOVEMBER 28

'Gossip Girl' (8PM ET, The CW)
Lily, Charlie and Serena eagerly anticipate the Studio 54 party being thrown in CeCe's (guest star Caroline Lagerfelt) honor. Nate takes on a new role at the Spectator, but his first big story turns out to be about someone he knows all too well. Blair turns to an unlikely person for help.

'House' (9PM ET, Fox) midseason finale
In the fall finale, a prosecutor suffers from what he believes to be cardiac arrest during an interrogation at the witness stand. The team's preliminary diagnosis is hyper-anxiety, but when Adams and Park investigate the patient's home and find a hidden arsenal of firearms, they uncover a more alarming and deep-seated psychological disorder. Also, Wilson becomes obsessed with proving that House is hiding something in his home, Park slowly comes out of her social shell and Foreman's lack of romantic relationships piques the interest of Taub and Chase.