Taylor Momsen as Cindy-Lou Who in Dr. Seuss' How the Grinch Stole Christmas
After her breakout role at 6 years old as Cindy-Lou Who, with her famously wacky hair and a passion for Christmas, Momsen later appeared in Gossip Girl as Jenny Humphrey before trading acting in for a career for music. She's now frontwoman of rock band the Pretty Reckless.