Season 1 - Episode 18

18 - Much 'I Do' About Nothing

Blair decides to take matters into her own hands and deal with Georgina Sparks (Michelle Trachtenberg); Lily prepares for her wedding day with Rufus on her mind; Serena finally tells Dan the truth about her past. After Serena tells Dan about what happened, they finally work things out.
Georgina's parents are tired of her antics and tell her that things won't be alright if she doesn't get her act together. Blair is there for support... or is she? The Sparks want to send their daughter to a boot camp for troubled girls. At the wedding, Bart, Lily, Chuck and Eric are all smiles. Rufus surprises Lily in the bridal chamber.