YouTube sensation Keenan Cahill is far from your average high school student. For one thing, he has overcome incredible adversity, suffering from a rare genetic disorder called Mucopolysaccaridosis (MPS-6) since birth. For another, at the young age of 17, Cahill has already achieved international superstardom- all from behind a webcam in his childhood bedroom. <br /><br />It was his cover of Katy Perry’s “Teenage Dream” that first threw Cahill into the spotlight. Earning millions of views on YouTube and a legion of adoring fans for its lovably goofy take on Perry’s ode to teenage love, Cahill suddenly found himself in the midst of a whirlwind of media attention. The video has over 50 million views to date. Suddenly, Cahill was a celebrity himself.<br /><br />Since then, Cahill has collaborated with some of the biggest names in Hollywood- celebrities including comedienne Chelsea Handler, pop act LMFAO, hip-hop artist 50 Cent for his song, “Down on Me,” TV personality Jimmy Kimmel, actress Jennifer Aniston and “Jersey Shore” sensation, DJ Pauly D for his song, “Beat Dat Beat.” <br /><br />For a kid whose life had, up to that point, been defined by what he couldn’t do as a result of his rare genetic disease, MPS VI (estimated to occur once in every 340,000 live births), the impossible became possible almost overnight.<br /><br />Cameo’s including 50 cent for “Down On Me” circulating over 29-million views, David Guetta’s Mega-Mix with over 17-million views and DJ Pauly D in “Beat Dat Beat” with over 4-million views, Cahill is the 27th highest subscribed music artist on YouTube. <br /><br />In addition to Cahill’s wildly successful YouTube channel and a winningly funny appearance on E!’s “Chelsea Lately,” Cahill has also appeared in viral campaigns for the Smartwater (starring Jennifer Aniston). Cahill has a slew of popular new videos with celebrities including country music superstars The Oak Ridge Boys, supermodel Tyra Banks, R&B singer, Lloyd, and Footloose star, Julianne Hough.