Selena Gomez and Demi Lovato have it all-- hit shows and movies on the Disney Channel, musical talent, and, most importantly, each other to lean on. These best friends are there for each other through thick and thin, from unsuccessful auditions and failed pilots to Selena's starring role on Disney Channel's Wizards of Waverly Place and Demi's breakout performance in Disney Channel's Camp Rock, her tour with the Jonas Brothers, and their release of...