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 spent eight years as Tim Allen's youngest son, Mark, on Home Improvement. "By 15, I got to travel the world, make a speech on the White House lawn, fly a blimp," says Smith. "But I didn't have some very basic normal kid experiences."