Blair Waldorf is a fictional character from the television series Gossip Girl, which aired from 2007 to 2012. She is portrayed by actress Leighton Meester and is known for her ambitious and fashionable personality. Blair is a wealthy socialite living on the Upper East Side of New York City and is often seen as a leader among her peers. Throughout the series, Blair navigates complex relationships, particularly with her best friend Serena van der Woodsen and her on-again, off-again boyfriend Chuck Bass. Her character is defined by her strong will, loyalty, and desire for success, making her one of the show's most memorable figures.