Leighton Marissa Meester (born April 9, 1986) is an American actress and singer. Meester starred as Blair Waldorf in the CW's teen drama series Gossip Girl (2007–2012). 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) That's My Boy (2012).

In addition to her acting career, Meester has also ventured into music. She released two singles, recorded songs for various soundtracks and collaborated with several artists, being notably featured on Cobra Starship's "Good Girls Go Bad" (2009). Her musical style has since shifted from pop to folk. In 2012, she embarked on a mini tour with folk band Check in the Dark, whom she had been working with since 2010.