Blair takes matters into her own hands to help Serena with the manipulative and evil Georgina Sparks. Lily, while keeping Rufus in her mind, prepares for her wedding with Bart Bass that is designed to be the Upper East Side?s social event of the year. Serena finally tells Dan the whole truth about her past and they try to work things out after Dan has cheated on her, will it be too late? An unexpected guest shows up at Lily and Bart?s wedding. Georgina goes somewhere where she can do no harm. Blair plans to go somewhere with Chuck.
In the first-season finale, Blair comes to Serena's defense and faces off with Georgina, while an emotional Serena finally comes clean to Dan about her past. Elsewhere, Lily continues planning her extravagant wedding to Bart, but thoughts of Rufus keep distracting her. Model and heiress Lydia Hearst guest stars as Lily's interior decorator.
