Blair Cornelia Bass (née Waldorf, previously Grimaldi) is a main character in the Gossip Girl series of novels and its television adaption, in which she is portrayed by Leighton Meester. Blair has an ongoing up and down relationship with Chuck Bass, and after Serena van der Woodsen and Dan Humphrey, they have the second longest relationship in the series. Blair is regarded as the "Queen Bee" of the Upper East Side. She is best friends with Serena and good friends with Nate Archibald and Dan Humphrey. Along with Dan and Serena, Blair appears in every episode of the series.