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!

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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.