Leonardo DiCaprio

Before "Titanic" and "Gangs of New York," Leonardo DiCaprio burst on to the scene as a child star in "What's Eating Gilbert Grape," where he played the mentally challenged Arnie and earned an Oscar nom. His success has increased exponentially, leading him to star in "Catch Me If You Can," "The Departed," and "Inception." He is also an environmental advocate. DiCaprio funded, wrote, and narrated a documentary about the effects of humanity on Earth.