Natalie Portman excelled alongside Jean Reno in the blockbuster classic Leon. The beginning of a great career!
Kristen Stewart began her career at the age of 12. She starred alongside Jodie Foster in the blockbuster movie Panic Room back in 2002.
Can you remember Reese Witherspoon, Natalie Portman and Ryan Reynold's first roles?
We've checked them out and assembled this gallery for you...