Ah! 20 year-old Mariah Yeater, who claims Justin Bieber is the father of her 3 month-old baby Tristyn, originally accused her ex-boyfriend John Terranova of knocking her up last year.

SCANDAL: Mariah Yeater: “Justin Bieber Is The Father Of My Baby!”

John’s grandma, Frances Lippe, revealed Mariah came to their home to tell he was the father of her child in December 2010. When John said he could not be the daddy, Mariah got angry, broke a car window, left, returned and slapped her ex-boyfriend tree times before finally getting arrested for battery.

Justin Bieber’s Alleged Son: Baby Tristyn FIRST PHOTOS

Frances and her grandson never heard from Mariah again until she made headlines as J Bieber’s alleged baby mama a few days ago. John told the NY Post, “I know it’s not Justin Bieber … She just wants money. It’s a scam.”

Mariah Yeater PHOTOS: Justin Bieber’s Alleged Baby Mama

So who’s the father of the poor baby? Mariah might not even know who the real baby daddy is. She gave birth to baby Tristyn in San Diego, California on July 6, 2011. The name of the father was not listed in the birth certificate.