Kayden Stephenson, 16, looks like your typical teenage boy. Cute, blonde hair, a billion dollar smile. The Tulsa-based teen auditioned on tonight's (Jan. 31) episode of 'American Idol' in Oklahoma City, revealing that he has been singing since he was four and that this is his dream. Standard 'Idol' stuff, right? Not even close, since he suffers from cystic fibrosis.