"Robert got a magazine cover with a picture of his face on it and pinned it to a dartboard that was in his trailer," Contactmusic quoted the source as having told the National Enquirer magazine. "He took shots at it and asked everyone else to do the same," said the insider.
The 23-year-old is finding it hard to cope up with his newfound fame, and has confessed that he came close to losing it earlier this year.
"I was getting really paranoid. But then I realised that if tomorrow I say, 'OK, I've had enough we're stopping everything,' it won't change anything," he said. He added: "Might as well try to accept it and stay Zen as I have no control over it. It's not always easy. But whining won't change anything."