Born: July 26, 1993 It would be difficult to imagine a more conspicuous or thrilling big-screen debut for a child actress than that of St. Louis-born Taylor Momsen, selected out of innumerable hopefuls at six years old to play Cindy Lou Who in Ron_Howard's colorful holiday fantasy How the Grinch Stole Christmas (2000). The Momsen was already an on-camera veteran when she signed for the part (given her appearance in a Shake 'n Bake commercial at three years old, and one-shot roles on the series Early_Edition and Cosby), The_Grinch nevertheless heightened her exposure.Not long after The_Grinch, Momsen stuck with the same genre: the family-oriented fantasy Hansel & Gretel (2002), which sported Lynn_Redgrave. That very same year, however, the pint-sized ingenue returned to A-list material with small contributions to two acclaimed blockbusters: Mel_Gibson's military drama We_Were_Soldiers and the can't-miss sequel Spy Kids 2: The Island of Lost Dreams (2002), directed by Robert_Rodriguez. Her next major cinematic contributions arrived in 2007, with turns in the FX-heavy canine superhero picture Underdog and Gus_Van_Sant's coming-of-age drama Paranoid_Park.Despite all of her work in high-profile films, Momsen broke through to mainstream notice in 2007 via her involvement in a prime-time teen soap opera: the CW's Gossip_Girl. On that series, the actress played Brooklyn-dwelling wannabe social climber Jenny Humphrey (younger sister of Dan), who was a good girl at heart but flirted with misbehavior in her quest to become part of the rich-girl clique at her prep school.Nathan Southern, Rovi