query: How many books did Gossip Girl have?
passage: Gossip Girl (novel series)
Books nine, ten and eleven of the main series were ghostwritten.[8][9]
passage: Gossip Girl
At the conclusion of the fourth season, Momsen, who went on an indefinite hiatus during the season while retaining regular billing, and Jessica Szohr both left the show. Throughout the series' run, Connor Paolo consistently declined to elevate his recurring role of Eric van der Woodsen to regular status, citing personal reasons for his decision. After becoming a regular on the ABC series "Revenge", Paolo confirmed his departure from "Gossip Girl" in August 2011.