Alleged Real Father of Alleged Justin Bieber Baby May Speak Out

TMZ broke the story that Mariah Yeater sent text messages to a friend ... fingering her ex, Robbie Powell, as the baby daddy.

Sources close to Powell tell TMZ ... he's making his move because he's tired of Yeater using the kid for media attention.

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.

According to our sources, Powell has been approached by several media outlets to tell his story and he's reviewing his options.