Blake Ellender Lively is an American actress. Born in Los Angeles, Lively is the daughter of actor Ernie Lively, and made her professional debut in his directorial project Sandman (1998). She had her breakthrough playing Bridget Vreeland in The Sisterhood of the Traveling Pants (2005) and its 2008 sequel, to commercial success. After starring in the comedy Accepted (2006), Lively achieved international recognition for her portrayal of Serena van der Woodsen in the CW teen drama television series Gossip Girl (2007–2012). During this period, she also starred in the romantic comedies New York, I Love You (2008) and The Private Lives of Pippa Lee (2009), the thrillers The Town (2010) and Savages (2012), and the superhero film Green Lantern (2011).

The Sisterhood of the Traveling Pants is a 2005 American coming-of-age comedy-drama film directed by Ken Kwapis from a screenplay by Delia Ephron and Elizabeth Chandler, based on the 2001 novel of the same name by Ann Brashares. It stars America Ferrera, Amber Tamblyn, Blake Lively and Alexis Bledel. It follows four best friends who buy a mysterious pair of pants that fits each of them despite their differing sizes. They share the pants equally as they spend their first summer apart.