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Justin Bieber fans tweet death threats to Mariah Yeater

If there is one thing Mariah Yeater (you know, the woman who claims Justin Bieber is the father of her baby) can learn from this whole experience, it's to never, ever, ever cross a Belieber. Whether or not her allegation is true, Bieber fans have come out in full force on Twitter, sending death threats to Yeater.

Warning: The following Bieber-related tweets contain offensive language.

Twitter user @Evelyn Horwitz wrote in rhyme, tweeting, "Dear Mariah Yeater, Roses are red, violets are blue, stay away from Bieber or Beliebers will kill you."

@UnbrokenAriana expressed her rage in a slightly less poetic fashion, writing, "Mariah Yeater blames Justin Bieber 'cause she's pregnant…Oh #ThatsWhatHoesDo. Hoe. B***h. Moneywhore. Slut… GO DIE B***H ;@"

And @alainaominika kept her tweet disturbingly simple, writing, "Mariah Yeater can die. (:"

(Who knew a happy-face emoticon could be so sinister?)

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Clinical psychologist Dr. Jeffrey Gardere spoke with FOX411.com about the Beliebers phenomenon.

"These girls are obsessed with Justin. They probably think the girl is lying about being with him, and trying to take advantage of him," he said. "They may believe that, in many ways, she is destroying the squeaky-clean image that they love about him, so they are angry about it."

Related: Could a new law send Justin Bieber to jail?

But not all JB fans are typing death threats to Yeater. A few have managed to find humour in the situation.

@iJDBiebersfan wrote, "Mariah Yeater is pregnant with Justin Bieber's child. Also, Barack Obama is white & Micheal Jackson is still alive living on a unicorn farm."

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Michael Jackson seems to be a popular theme among Beliebers, as @SelinaDenmark paraphrased the lyrics to Jackson's song "Billie Jean."

"Imagine @justinbieber singing "Mariah Yeater is not my lover, she's just a girl who claims that I am the one. But the kid is not my son."

Hmm ... could a Justin Bieber cover of "Billie Jean" be right around the corner?