<Table> <Tr> <Td> </Td> <Td> This article needs a plot summary . Please add one in your own words . (April 2012) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs a plot summary . Please add one in your own words . (April 2012) </Td> </Tr> <P> Blair takes matters into her own hands to help Serena deal with the manipulative and evil Georgina Sparks who threatens to expose Serena's secret . 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 about Georgina and they try to work things out . But Dan is guilt - ridden after having cheated on Serena with Georgina and wonders if it is already too late . An unexpected guest shows up at Lily and Bart's wedding . Also Blair manipulates matters so that Georgina goes "somewhere where she can do no harm". As the end of the school year approaches, Blair plans to go somewhere with Chuck . </P> <P> For the wedding during the first season finale, Gossip Girl costume designer Eric Daman dressed Blake Lively in a yellow floral bridesmaid dress designed by Ralph Lauren while Kelly Rutherford wore a custom - made Vera Wang wedding dress . Eric Daman considers Serena's Ralph Lauren bridesmaid dress as one of his eleven favorite looks from the series in a September interview for New York Magazine . </P>

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