Exclusive Interview with Great-Grandfather of Baby Allegedly Fathered by Justin Bieber

INSIDE EDITION speaks exclusively to the grandfather of the woman making the shocking claim that 17-year-old pop star Justin Bieber is the father of her baby.

Eddie Markhouse says it's true, Justin Bieber is the father of Markhouse's great-grandson!  

"Deep down in her heart [she] swears it's his child," Markhouse said. "We were all kind of shocked too to find out."

INSIDE EDITION spoke exclusively to Markhouse in the kitchen of his home in Las Vegas. He's the grandfather of Mariah Yeater, the woman who claims she had a one-night stand with Justin Bieber last year and gave birth to his son.  

"She met him at a concert and he sent two security guys down off of the stage to bring her backstage to meet him and she said they partied and were, I guess, having some drinks or something and, and they, they indulged in sex," Markhouse said.

Markhouse, a retired cab driver, helped raise Mariah and has a close relationship with her. He saw the baby for the first time two weeks ago when Mariah came to visit.
"I couldn't put him down. I mean he's just a happy baby, and well taken care of, a little chubby face," he said.

Markhouse says he was kept in the dark about the identity of the father until just a few days ago, when he was told the baby was Justin Bieber's.

"She's basically an honest, good person. She's got a heart, you know, a big heart," he said. "I can't see her lying about it."