Michael Richards -- Mobbed By Kramer Fans in NYC

It's been nearly 4 years to the day since his nuclear meltdown at an L.A. comedy club ... and Michael Richards is in higher demand than ever -- drawing Bieber-sized crowds last night in the Big Apple.

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You gotta see it -- Richards rolled through Times Square with his lady friend cool as a cucumber ... and you won't believe how many people swarmed the "Seinfeld" star looking for autographs.

Yippie-yi-yeah!