American actress and musician, born July 26, 1993, gained fame as Cindy Lou Who in "How the Grinch Stole Christmas" (2000). She played a prominent role as Jenny Humphrey on the TV series "Gossip Girl" (2007-2012). Transitioning to music, she became the lead vocalist for rock band The Pretty Reckless. Known for her edgy style and distinctive voice, she has released several successful albums with the band, including "Light Me Up" and "Going to Hell."