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!

KIRK CAMERON

Then: He played adorable rascal Mike Seaver on Growing Pains and saw his signature smirk splashed across the covers of '80s teen magazines. "I was 15 and getting 10,000 fan letters a week," says Cameron.