On Aug. 13, US Weekly reported that Ciara and Future ended their engagement just three months after the "Body Party" singer gave birth to their son, Future Zahir Wilburn. Reports said that Ciara caught Future cheating on her with another woman but didn't name who the alleged mistress was.

Now Media Take Out is reporting that the rapper was allegedly messing around with Rihanna while Ciara was at home taking care of their newborn son.

"Rihanna worked with Future all this summer, for a bunch of tracks for her new album. The pair spent many late nights in the studio together, while Ciara was at home with her baby," MTO wrote. "And it was during this time that people started whispering that Rihanna and Future were having more than just a business working relationship."

According to the site, Ciara confirmed her suspicions and immediately called off the engagement. MTO claims Rihanna and Future was spotted partying together over the summer.

"Future promised that he would just make music and then come back home to be with Ciara and their baby," a friend told the gossip site. "But he was out in the club with [Rihanna]."

Reportedly, Ciara and her friends "hate" Rihanna and her fiance was well-aware of the supposed feud.

"Future is a rapper, so he's going to be messing around. It's one thing if he's with some stripper on the road, or with one your babys mothers," the source said. "I'm not saying it's right, but things happen. But to be [allegedly] f**king the nasty b**ch that your fiance hates... while Ciara's at home taking care of your baby less than a mile away. That's some s**t you just can't forgive."