Flashback: The best celebrity Halloween costumes of 2015

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Nick Cannon and ex Mariah Carey got festivewith their kids at the singer's Halloween bash at her Airbnb Beverly Hills estate.
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Meanwhile, pop star Ashanti had the blues as an adorable Smurfette.
Photo: Getty Images
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Foxy singer Nicole Scherzinger also stepped out for Heidi's big bash.
Photo: Getty Images
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