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Holiday Movie Kids: Then & Now

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Cindy Lou Who, 'How the Grinch Stole Christmas'

NOW: Momsen, now 21, is the wild child singer of a band called The Pretty Reckless. She also appeared in three and a half seasons of "Gossip Girl," and has not acted since the series ended. —XFINITY Entertainment Staff (Photo by Bryan Steffy/Getty Images)



The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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