Gwen Stefani brought high-wattage glamor and an avalanche of tulle to the New York premiere of Amazon’s Christmas dramedy “Oh. What. Fun.” The “Luxurious” singer instantly dominated the carpet with a look that begged to be discussed. Her sheer Vera Wang gown delivered spectacle in spades, but whether it delivered coherence is another story.

Gwen Stefani opts for Vera…

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