J.K. Rowling's Flawless Response to Critic of Serena Williams

PHOTO: In this file photo, J.K. Rowling attends The Warner Bros. Harry Potter Tour on Nov. 9, 2013 in London. Right, Serena Williams attends the Wimbledon Champions Dinner at The Guildhall, July 12, 2015, in London.PlayDavid M. Benett/Getty Images| Karwai Tang/Getty Images
WATCH JK Rowling Smacks Down Serena Williams Internet Troll

"Harry Potter" creator and author J.K. Rowling has always been known to speak her mind.

So, when a Twitter user made fun of Wimbledon champ and 21-time grand slam winner Serena Williams over the weekend, Rowling took action.

It all started when Rowling tweeted "#SerenaSlam! I love her. What an athlete, what a role model, what a woman!" on Saturday.

She also tweeted, "I'm #TeamSerena today, because you don't meet many super-talented people nicer than she is. Go @serenawilliams!"

Someone then made fun of Williams' body, tweeting that she looks like a man, to which Rowling replied, "'she is built like a man'. Yeah, my husband looks just like this in a dress. You're an idiot."