Lily and Rufus move up their wedding day, but someone or something will come between them. Can they overcome this and finally get married? Chuck uncovers Carter’s secret. Georgina traps Dan and Vanessa into one of her schemes. Blair suspect something not good about Bree and shares her concerns with Nate.
Serena returns from her trip to Spain with Poppy and Gabriel. Blair makes a secret deal with Nate’s grandfather. Dan takes a job to earn money for college.
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 but it might 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.
Serena slips back into her old habits because she is ashamed of her secret. She eventually reveals it and her friends Blair, Nate and Chuck have to put their differences aside, in order to help her. Unfortunately, Serena is too ashamed to share the truth with Dan, therefore he assumes the worse about his girlfriend.
Meanwhile, Rufus is excited when his band is invited to perform at a Rolling Stone-sponsored concert, but Lily is the last person on earth he expects to see at the performance, especially since her wedding rehearsal dinner is the same night.