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Secret Child Stars

12 of 16

Katherine Heigl

Katherine Heigl found success as Dr. Izzie Stevens on ABC's "Grey's Anatomy" in 2005, but she started her acting career much earlier. Heigl made her on-screen debut at the age of 14 in the 1992 movie "That Night." —XFINITY Entertainment Staff (Photos by Getty Images, Alcor Films)

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

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