Justin Bieber: kinda vindictive

Apparently no one ever taught Justin about Rule Number 34: "Be a better person than the disturbed person who's trying to blackmail you and, you know, don't taunt her after she's disappeared back into obscurity."

Us has this: "That'll teach Mariah Yeater not to get on Justin Bieber's bad side again! Teen pop phenom Bieber revealed in a Tuesday press conference that he has penned a track about Yeater, the woman who claimed the singer impregnated her backstage at a 2010 concert. "[I've written] a song about that whole situation with that girl who said she's having my baby - Mariah Yeater," AOL quotes Bieber, 18, as saying. Expected to be included on his upcoming disc Believe, the song is "about everything I've gone through." News of the teen's track comes three days after Bieber mocked Yeater, 20, on Twitter. "Dear mariah yeeter…we have never met…so from the heart i just wanted to say…" Bieber wrote, linking to a YouTube clip of Sacha Baron Cohen's Borat character repeating, "You will never get this. You will never get this. La la la la la…" Last October, Yeater claimed she became pregnant with Bieber's baby after a sexual encounter at L.A.'s Staples Center when she was 19 and Bieber was 16. Vehemently denying paternity, Bieber - who says he never met Yeater - took a DNA test to prove her wrong."