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Kim Kardashian busted her ass to lose 16 pounds for The Met Gala, and anyone accusing her of doing it in an unhealthy manner just doesn't get it ... so says her longtime trainer, TMZ reported.

We got DON-A-MATRIX out in L.A. who says Kim dropped some serious lbs the old-fashioned way ... hard work and dieting. Don was with Kim through the three-week process, and says at no point did she "starve" herself.

Not only that, Don says Kim was an animal in the gym—working out 2 times a day—and sticking to a well-balanced diet.

He says Kim's not his only client who lost a lot of weight in a short period of time ... other clients have lost even more—the key is exercise and healthy eating.

TMZ broke the story, when Kim first tried on Marilyn Monroe's "Happy Birthday, Mr. President" dress back in March, it didn't fit, and The Ripley's Museum actually rejected her request to borrow the dress for the Met Gala.

Determined, Kim dropped the weight, and came back a few weeks later—and the dress fit, and Ripley's was down with the Met.

Not everyone was impressed, however, by Kim's weight loss.

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