Taylor Michel Momsen (born July 26, 1993) is an American singer, songwriter, model, and former actress. She is known for portraying the character of Jenny Humphrey on The CW's teen drama series Gossip Girl (2007–2012) and Cindy Lou Who in the film How the Grinch Stole Christmas (2000). After her retirement from acting, she became widely known for being the frontwoman of the American rock band The Pretty Reckless.