Taylor Michel Momsen (born July 26, 1993) is an American singer, songwriter, former actress and model. She is known for portraying the character of Jenny Humphrey on the CW teen drama series Gossip Girl (2007 -- 2012) and Cindy Lou Who in the film How the Grinch Stole Christmas! (2000). She is also known for being the lead singer and frontwoman of the American rock band The Pretty Reckless.\n\nThe girl that played cindy lou who in the grinch? Let's think fast. Stream of consciousness:
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To answer this question, we should know that: She is known for portraying the character of Jenny Humphrey on the CW teen drama series Gossip Girl (2007 -- 2012) and Cindy Lou Who in the film How the Grinch Stole Christmas! (2000). So the final answer is Taylor Michel Momsen.
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