Leighton Meester first appeared in the Episode: "Disciple" of the American police procedural and legal drama television series ‘Law & Order.’ She continued to appear in television series like ‘Boston Public’ (2001), ‘Once and Again’ (2002), and ‘Family Affair’ (2002) before making her big-screen debut in the 2003 horror suspense film ‘Hangman's Curse’ directed by Rafal Zielinski. The film was largely panned by critics and received a 0% approval rating on Rotten Tomatoes. She was next seen in television series like ‘Crossing Jordan’ (2004), ‘7th Heaven’ (2004), ‘North Shore’ (2004-2008), ‘24’ (2005), ‘Veronica Mars’ (2005), ‘Surface’ (2005-2006), ‘Monster Allergy’ (2006), and ‘House’ (2006). In 2007, she joined the main cast of the American teen drama television series ‘Gossip Girl’ where she portrayed Blair Waldorf. The series spawned 6 seasons before going off-air in 2012. Meester also received 2 ‘Teen Choice Awards’ for her performance in the series. She next appeared in films like ‘Killer Movie’ (2008), ‘Date Night’ (2010), ‘Going the Distance’ (2010), and ‘Country Strong’ (2010). In 2011, she starred as ‘Rebecca Evans’ in the American Psychological thriller film ‘The Roommate’ directed by Christian E. Christiansen. The film received mostly negative reviews from critics but managed to gross over $52.5 million on a budget of $16 million. That same year, she also appeared in the American adventure-romantic comedy film ‘Monte Carlo’ directed by Thomas Bezucha. The film opened to a mixed critical reception and earned a 40% approval rating on Rotten Tomatoes.
Meester continued to star in films like ‘That's My Boy’ (2012), ‘Life Partners’ (2014), ‘The Judge’ (2014), ‘Like Sunday, Like Rain’ (2014), ‘By the Gun’ (2014), ‘Unity’ (2015), and ‘Semper Fi’ (2019). She was last seen in the 2022 American thriller film ‘The Weekend Away’ where she played the role of ‘Beth.’ The film received mostly positive reviews from critics.