Jaden Smith
Age: 13
What He's Done: Slummed with his mega-star dad in 'The Pursuit of Happyness'; made like Ralph Macchio in last summer's hit remake of 'The Karate Kid'; rapped alongside the Beebz on 'Never Say Never.'  
What's Next: Reteaming with dad in M. Night Shymalan's sci-fi epic 'One Thousand A.E.'
Did You Know?  Jaden is a youth ambassador for Project Zambia, helping children orphaned by AIDS in Africa.