Here’s Your Favorite Child Star Who are All Grown up, Then&Now

89. Peter Costa

As Rudy's silent friend Peter, Costa is a much-loved member of the '80s hit series. But Costa is definitely making noise now - after leaving Hollywood shortly after his appearance on The Cosby Show, Costa embarked on a musical career. Currently, Costa plays for Torrential Downpour, PT Grimm and Kreptatka Bar Band.