Sneak Peek! Child Stars: Then & Now

Find out where Kirk Cameron, Blossom's Mayim Bialik, the Charles in Charge girls and more child stars are in this excerpt from PEOPLE's new book, in stores June 23!


Then: He played a computer geek who builds the perfect woman (played by Kelly LeBrock) in the 1985 hit Weird Science. "It was really luck – luck that I was happy people mistook for a skill," Smith says about his acting career.