Taylor Michel Momsen is an American singer-songwriter, guitarist, model, and former actress. Prior to her retirement from acting, she portrayed the character of Cindy Lou Who in the film How the Grinch Stole Christmas (2000), Alexandra Anami in Spy Kids 2: The Island of Lost Dreams (2002), Molly in Underdog (2007), and Jenny Humphrey on The CW's teen drama series Gossip Girl (2007–2010; 2012). Momsen has been the frontwoman of the American rock band The Pretty Reckless since their inception in 2009.