Teenage pop star Justin Bieber has spoken up about the reports that his mum Pattie Mallette received a $50,000 offer to pose topless for men's magazine Playboy, saying that the story made him feel ill.

According to online reports, Mallette was thinking of taking the offer - a rumour that was immediately denied by Bieber's representatives.

Now, the Canadian singer has finally told his fans via Twitter how disturbed he was with the Playboy issue.

"That rumor just grossed and wrded me out (sic)... My mom is a moral woman. Let's just leave that one for what it is," he tweeted.

There were also reports that Bieber has been killed, to which he said, "Turns out I'm alive."