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JK Rowling already has form when it comes to putting people in their place on Twitter. She famously once advised someone they might want to buy a 'penis enlarger'.

So when a troll replied to a congratulatory tweet from Rowling to Serena Williams following her sixth Wimbledon win yesterday with a body-shaming comment, the Harry Potter writer didn't hold back.

The troll, who had attributed William's tennis success to her being 'built like a man', was quickly slammed down by 49-year-old Rowling, who branded them an 'idiot'.