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'RHOBH': Why Lisa Vanderpump Says Her Co-Stars Should Believe Her After Lie Detector Test (Exclusive)

ET spoke with 'The Real Housewives of Beverly Hills' star at the 4th Annual World Dog Day presented by PetPlan Pet Insurance, where she vehemently defended her choice to get a lie detector test after her co-stars accused her of leaking a story about Dorit Kemsley to a tabloid.
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