Bieber Baby Claims: Yeater's Ex 'Positive' He's The Dad

Robbie Powell allegedly wants to take a DNA test to prove it...

The ex-boyfriend of Justin Bieber's rumoured baby mother has slammed her accusations, stating he's positive Mariah Yeater's son is his.

Following news that the Biebster has taken a DNA test to prove he isn't the father of Yeater's son Tristyn, her former lover Robbie Powell has come forward, insisting he is certain he's the child's dad.

According to TMZ, Robbie is willing to take a paternity test to show that he is Tristyn's father, with sources close to Powell revealing he's making his move after becoming tired of Yeater using the baby to get media attention.

The celebrity gossip website claims that friends of Robbie have said: "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 is also said to have been approached by various media outlets to tell his side of the story, with TMZ adding that he is currently reviewing his options. Yeater's lawyers are yet to comment on the new developments.

Earlier this month, TMZ also uncovered a series of text messages from Mariah, which allegedly prove Robbie is her baby's father, with one apparently reading: "Pleeease ERASE ALL MESSAGES from my mom where she says Tristyn is Robbies Son Ill kick u when we get paid im trusting you pleeease."

WATCH OUR EXCLUSIVE JUSTIN BIEBER LIVE SESSION HERE  

GOT BIEBER FEVER? CHECK OUT PICS OF JUSTIN IN OUR GALLERY HERE!

Watch MTV News on the hour every hour on MTV - Sky Channel 126 and Virgin Channel 311