A masquerade event where Juliet succeeds in druvving Serena and gaslighting the entire group into thinking Serena has relapsed.

Upon returning to NYC, the focus shifts to the characters navigating early adulthood at Columbia University.

Her chance encounter with Prince Louis Grimaldi sets up a season-long royal arc.

Blair battles to maintain her "Queen Bee" status in a collegiate environment where high school tactics don't always land.

Season 4 is widely considered the peak of the show’s costume design by Eric Daman.