RHOA's Porsha Stewart in New Cheating Scandal -- All For The Show?

Atlanta socialite Crystal "Mocahantas" Barnes hasn't even officially joined The Real Housewives of Atlanta yet, but she's already at the center of a juicy storyline: Earlier this week, reports surfaced that Crystal's fiancé, producer Ralo Wonder, had an affair with RHOA star Porsha Stewart while she was still married to her ex, Kordell.

But now, a source close to Crystal has come forward to RadarOnline.com to claim that the whole thing was simply a fabricated storyline dreamed up by someone hoping to create drama for the show.

"It's a total lie," the source tells RadarOnline.com exclusively. "It's more than likely that someone just made it up for the show."

"Ralo and Crystal have been together for a while and they're happy and getting ready to get married," the source continues. "This whole thing is just made up."

What's more, RadarOnline.com has exclusively learned, Crystal is due to give birth to her first child with Ralo shortly.

Secure in their relationship, the couple is laughing off the cheating rumors. "They're happy," the douce insists. "With the show coming up and everything, they're just taking it day by day. But they're excited and we're all excited to see Crystal on TV soon."

Staged "reality" is nothing new for the Housewives franchises, as RadarOnline.com has reported. RadarOnline.com caught one instance of fabrication in the June 9 episode of Real Housewives of New Jersey, and witnessed the Real Housewives of New York repeatedly re-shooting scenes in the Hamptons on June 15.