Justin Bieber, baby daddy? His legal team is calling allegations in a reported paternity suit “malicious, defamatory and demonstrably false” and vowing to fight them.

Mariah Yeater, 20, made the claim in a paternity suit filed Monday in L.A., according to Star magazine, which said it has seen the lawsuit and its handwritten declaration from the 20-year-old single mom. A rep for 17-year-old Bieber’s legal team Tuesday told outlets including TMZ and RadarOnline that although hadn’t yet seen the suit.

The woman in question reportedly filed a paternity suit against Justin, claiming she and Justin Bieber had a special hug backstage at a recent concert at the Staples Center in L.A. … and 9 months later, she popped out a baby, baby, baby, oh.

Bieber just tweeted about the situation, saying, “Im going to ignore the rumors…and focus on what is real.

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