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Vivian Jaffe, played by Lily Tomlin, is a life coach and existential detective in the film "I Heart Huckabees." She helps the film's protagonist, Albert Markovski (Jason Schwartzman), navigate his existential crisis by introducing him to the concept of interconnectedness and the idea that everything is connected. Jaffe's character provides a unique perspective on life and helps Albert find meaning and purpose in his existence.