It seemed he was destined for teeny bopper-dom. His older brother was one of the biggest teen stars ever-David Cassidy, and Shaun wanted to follow in his footsteps. He did for a short time. He was a superstar in 1977 doing covers of old Ronettes songs like this one. Here's Da Doo Ron Ron with Shaun Cassidy! Enjoy and go ahead, scream a little!