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Victoria Beckham is clearing the air on her so-called moody reputation ... saying people viewed her as a "miserable cow," but she's really just smiling on the inside.

Beckham opens up in a new Netflix doc about giving off "ice queen" vibes while rising to fame as Posh Spice of the Spice Girls -- and later navigating the elite social scene with her famous hubby, soccer legend David Beckham.

In the aptly titled doc "Victoria Beckham," Victoria says she knew all about how people thought she "never smiled" and was just a “miserable cow."

Pretty harsh self-assessment, but Victoria insists she does actually smile, saying "don't be shocked." She explains it like this ... “Here’s a fact. I’ve looked miserable for all these years because when we stand on the red carpet, this guy (David Be

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