Leighton Marissa Meester (born April 9, 1986) is an American actress and singer. She is mostly known for her starring role as Blair Waldorf in the teen drama series Gossip Girl (2007–12). She has also appeared in the 2010 country drama film Country Strong, the 2011 thriller The Roommate, the 2011 romantic-comedy Monte Carlo, and the comedies The Oranges (2011) and That's My Boy (2012). Meester made her Broadway debut in 2014 in Of Mice and Men.
In addition to her acting career, Meester has also ventured into music. In 2009, she was featured on Cobra Starship's "Good Girls Go Bad" and released her first single "Somebody to Love" with Universal Republic. Her second single "Your Love's a Drug" was released in 2011. Meester also recorded songs for various soundtracks. Her debut album, Heartstrings was independently released in 2014.