Premise: Leighton Marissa Meester ( born April 9 , 1986 ) is an American actress , singer-songwriter and model . She is mostly known for her starring role as Blair Waldorf in the drama series Gossip Girl ( 2007 -- 2012 ) . Meester made her Broadway debut in Of Mice and Men ( 2014 ) . In addition to acting , Meester has also ventured into music .
Hypothesis: Leighton Meester is a person.
Label: ENTAILMENT