Justin Bieber's Alleged Baby Mama Now Getting Death Threats!

J.B.'s fanatical supporters are none too happy with the woman who claims to have had his child

If you're going to claim Justin Bieber is the father of your baby, don't be too surprised to face the wrath of some Beliebers.

Mariah Yeater, the 20-year-old woman who has reportedly filed a paternity suit against the 17-year-old teen sensation, is now the target of death threats by enraged Bieber fans upset (and maybe jealous?) over the salacious allegations.

Oh baby!

Since the bombshell news broke that the unemployed Yeater claimed to have had unprotected sex with the "My World" singer backstage at his Oct. 25, 2010 concert in L.A. which led to the pregnancy, Facebook pages have sprung up slamming his accuser.

But the worst of the venom appears to be spewing on Twitter. Here's a sampling:

"I could kill this bitch, really she messes with my baby!!! SHE IS SOOO DEAD," tweeted a user named @BeccaLindsay.

"I should give you a device. Well, go away before millions of Beliebers kill you," wrote another with the handle @HarenortizJDB, presumably meaning to offer Justin's accuser advice.

"Marian Yeater is so DEAD," tweeted @TurkishBeliebr who linked to several Tumblr animations containing even more threats.

"Roses are red, violets are blue Mariah yeater we are gunna kill you," tweeted @SessyKidrahi

Other Yeater haters meanwhile are calling her everything from a "fame whore" whose name "sounds like a disease" to a "lying f--k."

Talk about nasty.

Bieber's camp has since denied the paternity claims first reported by Star magazine and vowed to pursue "all available legal remedies" to protect his good name and rep. While the crooner himself tweeted that he's just going to "ignore the rumors" and "focus on what is real."

A lawyer for Yeater could not be reached for comment.