Charles Bartholomew "Chuck" Bass is a main character in the Gossip Girl television adaptation and a recurring character in the series of novels with the same name. He is portrayed by Ed Westwick. They marry in the series finale. He is best friends with Nate Archibald. He is also good friends with Serena van der Woodsen and Dan Humphrey.
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And it fit the story completely. For those of you who only tuned in to see Chuck Bass kiss a dude, you may have felt disappointed. You see, Blair spent the summer picking out targets for Chuck to seduce — rich girls, models, actresses — and just as he was about to kiss the target, Blair burst into the room as the betrayed lover. So she calls up Chuck and says she has a target picked out.