Showing All I Want Is Everything by Cecily von Ziegesar
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It's Christmas and Blair and Serena are best friends again and up to their old tricks - partying hard and breaking hearts from Park Avenue to the Caribbean. And when school finishes, Blair, Serena, Aaron and company head down to blow off steam after their exams, and in between Pina Coladas, Blair and Serena plot revenge on super-jerk Chuck Bass.