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Justin Bieber’s ‘pop’ tune

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Justin Bieber yesterday flatly denied ever even meeting Mariah Yeater — much less fathering her 4-month-old son, Tristyn.

“None of the allegations are true,” the 17-year-old pop mega-star said on NBC’s “Today” show about Yeater’s claim of having been impregnated during a 30-second tryst in an LA arena’s bathroom. “It’s crazy that people want to make up such false allegations.”

“Never met the woman.”

PHOTOS: JUSTIN BIEBER

Meanwhile, The Post has learned that at least 11 months before filing a paternity suit against Bieber on Halloween, a pregnant Yeater told an ex-boyfriend that he was the baby daddy.

“She came back here from California telling me she was pregnant with my child, and I said this is impossible, you’ve been in California two months and back here for only a week,” said Yeater’s ex, Las Vegas resident John Terranova.

“After I told her that’s not my kid, you’ve only been here for a week, then she told me, ‘No, I got pregnant before I left by you,’ ” Terranova, 19, told The Post.

“But it didn’t make sense, because she had a doctor’s note saying she wasn’t pregnant enough for that to be possible.

“It didn’t add up.”

Terranova scoffed at her current claim that a 16-year-old Bieber knocked her up in October 2010.

“I know it’s not Justin Bieber,” he said. “She just wants money. It’s a scam.”

His current girlfriend, Lacy Jensen, who is herself pregnant, said, “She’s a gold digger and just wants someone to take care of her. She was a really big party animal who got around a lot.

“She’s scandalous.”

Yeater, 20, was arrested for battery last December for allegedly slapping Terranova after returning pregnant from a sojourn in California to find him dating Jensen.

“When Mariah saw her, she freaked out,” Terranova recalled of the Dec. 21 encounter at his home. “She came outside to Lacy’s white Honda Civic and picked up a brick and threw it through the back windshield and the back left passenger window. She broke those two windows.”

“Me and her got into a shouting match right there on the driveway, when all of sudden she told me to get out of her face . . . She hit me in the mouth three times.”