Justin Bieber Not The Father, Says Yeater's Ex

Things appear to be getting worse for Mariah Yeater as recent claims suggest she's a liar who targeted Justin Bieber for money and that her ex-boyfriend is in fact her baby's father.

Robbie Powell is adamant that he is the father of Trystyn Anthony Markhouse Yeater, and even wants to take a DNA test to end Yeater's false claims, TMZ reported.

According to the popular gossip site, "Our sources says Robbie has been telling friends ... Mariah told him the whole Bieber story was BS. We're told Robbie believes she did it for the money because she's desperate for cash."

Powell’s allegations come after reports that Yeater’s attorney Jeffrey Leving requested that Bieber take a second paternity test as the New Zealand Herald writes, "a member of his legal team was not present while it was administered, and he has no idea if the test was done using proper controls."

Leving explained, "I don't know if it was even his DNA. Evidence has to be properly supervised to make sure it is not corrupted. What I am hoping is to get DNA testing done for everybody and to have it done in a supervised setting."

Yeater's claims were questioned last week after a series of text messages allegedly sent by the California native to a friend went public.

As TMZ reported, "In one text, Mariah writes, "[John], would you please stress to Robbie how important it is for him to be in his son's life?.."

Sources claimed that soon after sending the damning texts, Yeater demanded that the unidentified friend delete all of her texts.

Bieber has publicly said he has never even met Yeater, despite her claims to have conceived her now 6-month-old after one of his concerts.

Yeater is said to be receiving death threats over her claims.