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Secret Child Stars

2 of 15

Jake Gyllenhaal

Jake Gyllenhaal is one of the most recognizable actors on the planet, but it is his little-known role in 1991's "City Slickers" that earns him a spot on this list. Gyllenhaal, who was just 11 at the time, appears as Billy Crystal's son in the film. —XFINITY Entertainment Staff (Photos by Jamie McCarthy, Getty Images, Castle Rock Entertainment)

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

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