Louis Tomlinson allegedly phoned a 24-year-old internet pest who had been sending inappropriate messages to his sister Lottie, 15.
She had reportedly been on the receiving end of messages from him, via text and Twitter, for months - this according to the Daily Star Sunday.
Among other things, he is said by the British tabloid to have sent her racy chat-up lines and semi-naked pictures. And when Lottie turned to Louis, he supposedly phoned him up.
Louis Tomlinson (WENN)
He is quoted as saying: "You're 24 and she is 15. What are you thinking?
"Don't even think about coming to the stadium tonight. I don't want to see you there."
A source told the newspaper: "Louis wanted to be focused on playing at one of the biggest venues in the country but his sister comes first and he wanted to make sure he was protecting her.
"He didn't hold back when he called the bloke. He was really angry about what had been going on."
Lottie has come off Twitter since the debacle.
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