[s3e21] Ex-husbands And: Wives

The episode focuses on the group's efforts to expose William van der Woodsen's true motives. While Serena remains fiercely loyal to her father, Rufus feels increasingly alienated from the family.

The episode features a major turning point for the series' core couples: [S3E21] Ex-Husbands and Wives

: Chuck and Jenny team up to uncover the truth about Lily’s medication. They eventually enlist Blair, who uses a black-tie event to trap Dr. Holland—the neighbor William used to write fake prescriptions. The episode focuses on the group's efforts to