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Child Stars: Then and Now

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THEN: Joseph Gordon-Levitt

Joseph Gordon-Levitt began acting at the age of six. He played small television and movie roles until 1996, when he landed the role of Tommy Solomon in "3rd Rock from the Sun." —XFINITY Entertainment Staff (Photo by Brenda Chase/Getty Images)

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

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