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Bieber's Alleged Baby Mama

THE MUG SHOT

11/4/2011 4:23 PM PDT BY TMZ STAFF

Mariah Yeater mugshot
TMZ has obtained the mug shot for the woman who claims she's Justin Bieber's baby mama ... taken moments after she was arrested for allegedly slapping her ex-BF last year ... the OTHER guy she accused of fathering her child.

As we previously reported, Mariah Yeater was charged with battery in December 2010 for slapping her ex-BF John Terranova ... after she told the guy he was the father of her then-unborn baby.

John claims the baby isn't his -- ditto for Bieber.

Yeater is due back in a Vegas courtroom in the near future.

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