What is the name of this actress?

Explanation

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