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Scarlett Johansson then and now.Jim Smeal/Ron Galella Collection via Getty Images, Jordan Strauss/Invision/AP
Scarlett Johansson booked her first acting job at 9 years old in "North" alongside Elijah Wood.
Ryan Gosling was a cast member on "The Mickey Mouse Club."
Ryan Reynolds got his start on a Canadian television show when he was 14 years old.
You know their names and faces, but do you know their earliest acting roles?
These Hollywood stars started their acting careers early. Some began in small parts on television shows or made-for-TV films, while others worked on critically acclaimed movies while they were young.
Here are 10 celebrities you didn't know were child stars.