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