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The Harry Potter author hotly calls an internet troll who says Serena Williams 'is built like a man' an idiot.

• Jul 12, 2015

AceShowbiz - J.K. Rowling defended Serena Williams online. The Harry Potter author quickly jumped to the athlete's defense on Twitter after the female tennis player was dissed by an internet troll over her physical appearance.

"Ironic then that main reason for her success is that she is built like a man," the hater wrote, to which Rowling quickly fired back, "Yeah, my husband looks just like this in a dress. You're an idiot." The reply was accompanied with pictures of Williams showing off her curves in a red form-fitting dress.

.@diegtristan8 "she is built like a man". Yeah, my husband looks just like this in a dress. You're an idiot. pic.twitter.com/BCvT10MYkI

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� J.K. Rowling (@jk_rowling) July 11, 2015

Before shutting up the hater, Rowling raved about Williams following her sixth Wimbledon win on Saturday. "I'm #TeamSerena today, because you don't meet many super-talented people nicer than she is. Go @serenawilliams!" she posted along with a picture of her with the tennis champ. She added, "#SerenaSlam! I love her. What an athlete, what a role model, what a woman!"