Alex Vause, played byLaura Prepon, is a recovering heroin addict and Piper's alluring international drug smuggler ex-girlfriend.
Alex first met Piper in a bar and the two started a relationship. They travelled the world in luxury thanks to Alex's dealings in the drug trade.
When Alex was eventually caught, she named ex-girlfriend Piper in her testimony which led to Piper's eventual arrest.
Alex's father is a washed-up former rock star who was never there during her upbringing. When she eventually met him, he introduced her to his drug dealer who got her into the criminal world.