Justin Bieber Flips Out; Feeling Baby Daddy Pressure? 1Teen pop star Justin Bieber proved that alleged baby momma Mariah Yeater had at least one thing right about him. He can be overly aggressive. He demonstrated as much in London.

The 17-year-old teen sensation has been accused by Yeater of having a backstage tryst with her at a concert last year that led to the birth of her son in July.

Bieber has sharply denied the charges, claiming he never even met Yeater, but he is due back in the United States later this week where he faces a paternity test that could prove he is the father.

Until he takes the test, it’s his word against hers, and he may be feeling escalating pressure because of what awaits him.

Bieber was spotted by photographers dining at Mr Chows in Knightsbridge, west London, with some of his team, according to London’s Daily Mail.

He shocked fans waiting outside when he acted surly and gave photographers the finger with each hand as he left the eatery, not once but twice.

It hardly conveyed the impression that Justin is carefree and has nothing to worry about, although negative press, which he’s experiencing for the first time in his young career, may be unsettling him.

Bieber did not offer to explain his obscene gestures.

As he left the restaurant, he pulled the collar of his gray coat up over his lower face and wore a blue cap emblazoned with the NBA’s Golden Gate Warriors logo.

Justin exhibited the same rude, aggressive gestures last year while out for a birthday dinner with girlfriend Selena Gomez, who looked horrified during the incident.

The lastest encounter marked the end of Justin’s stay in the UK on a sour note, according to The Mail. He left the country for Germany to appear on “X Factor.”

Yeater adamantly insists she has evidence that can prove Justin is the father.

If she can accurately describe his private body parts, or is aware of distinguishing features such as birth marks, scars or moles, the evidence could indeed be damning.

But a paternity test will trump all.

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