14) Michelle Trachtenberg in Gossip Girl (2008-2012)

When Michelle Trachtenberg was 22 years old, she got the part of the vixenish manipulative high school student, Georgina Sparks, whose outrageous stunts stirred up the Upper East Side. It was no small feat to be that good at such a young age, especially for an iconic character like Georgina—rebellious and sneaky.
Michelle added to Georgina's charismatic but out-of-control aspect that makes her character pivotal to much of the drama of this show. It blurred the lines between age and character; Georgina's devil-may-care attitude made her one of Gossip Girl's most unforgettable wildcards.
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Edited by Zainab Shaikh