Leighton Meester For Stewart Glowing Photoshoot. Kristen Stewart Then and Now. Leighton Marissa Meester (born April 9, 1986) is definitely an American actress, singer, songwriter, and fashion model famous on her role as Blair Waldorf inside the television series Gossip Girl. Mrs Globe 2011 Alisa Krylova. If you like this post please share a comment with us en tell what you think.