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The best-selling author put her razor wit to good use.

J.K. Rowling never hesitates to slam Donald Trump on Twitter, but her latest tweets might be her best yet.

The "Harry Potter" best-selling author wrote a series of tweets Tuesday, poking fun at Trump's cockiness about his writing skills after he said he prides himself on his way with words.

She didn't call him worse than Voldemort or that he was "riddikulus boggart" (all previous burns), this time Rowling simply responded with a serious of "haha's" suggesting that she was laughing uncontrollably. She only stopped to draw a breath (figuratively of course).

The writer ended her laughter with the fourth tweet in which she wrote, "wipes eyes, tries to control breathing Seriously, @realDonaldTrump is the Gratest Writer on earth."

J.K. Rowling, you truly are magical.

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