The author's website has notched up a whopping 220m hits since it was launched two months ago - making it the most popular website for kids.
Fans from as far away as Iraq, Libya and Tonga have logged on to the site.
JK used the site to tell fans the name of her sixth book - Harry Potter And The Half Blood Prince - and to announce that she was having a third child.
On the day the book title was revealed, the site was reportedly getting 600 hits per second.
Massive
It's currently receiving a massive 27m hits per week.
A spokesman for the site's designers said: "As with anything Jo has done, it's a phenomenon."
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