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Kanye West isn't just hanging around town with a mystery blonde, he's also married to her -- they recently had a private ceremony to celebrate their love ... TMZ has learned.

Sources connected to the couple tell TMZ the woman is Bianca Censori, and she's worked as an architectural designer at Yeezy for several years. She's also been a brunette until switching things up to the short blonde look we've recently seen.

Our sources say Ye and Bianca recently had some sort of wedding ceremony -- though we're told it doesn't appear they've filed a marriage certificate to make it legal.