Leighton Marissa Meester (/ˈleɪtən/; born April 9, 1986) is an American actress, singer, and model. She is known for her starring role as scheming socialite Blair Waldorf on Gossip Girl, which ran between 2007 and 2012 on The CW. She has also appeared in films such as Killer Movie (2008), Country Strong (2010), The Roommate (2011), Monte Carlo (2011), The Oranges (2011), The Judge (2014) and The Weekend Away (2022). She portrayed Angie D'Amato on the ABC sitcom Single Parents (2018–2020). Meester made her Broadway debut in Of Mice and Men (2014).