Ciara 'Ousts' Future Cheating Amid Broken Engagement: Rapper 'Creeps' With Tyrina Lee, Rihanna AND Keyshia Cole, How Did Baby Mama Find Out?

Ciara broke things off with fiance Future after she recently discovered his cheating ways. But how did the "Body Party" songstress prove that her longtime beau was fooling around with a slew of other women?

UPDATE: Tyrina Lee PHOTOS: Meet Rapper Future's Mistress, Ciara Ends Engagement After 'Personal Stylist & Shopper' Cheating Scandal Erupts On Instagram

Well, a (disreputable) source tells the infamous gossip tabloid Us Weekly:

"She found out about the affair through multiple sources in recent weeks... There was clear evidence when she approached Future about the cheating. This was clearly not just a one-night thing."

Rumors suggest that the "Honest" emcee was primarily fooling around with his "personal" assistant, Tyrina Lee:

He may have also hooked-up with fellow hip-hop princess Rihanna while they were working on a collaboration earlier this summer.

Now, get this - allhiphop.com insinuates that Future was also "romantically pursuing" R&B beauty, Keyshia Cole! According to this seedy "BlindItem" breakdown:

[Fiance] was so used to women flocking to him that he just couldn't seem to settle into only having one woman. In the past six months alone, he has cheated on her at least twice... and both of the women that we know about are famous!

Mistress 1 is probably the most famous person in this story. She was working on a project with Fiance, and there were some whispers that the two of them had gotten close. Our Bride-to-be initially dismissed the rumors as gossip, but later found out that the rumors were all true. Bride was furious... but her Fiance managed to convince her that it was nothing more than a few casual hookups and that it was totally over. Groom-to-be and Mistress 2 worked on a project together a few years ago. Nothing happened then, but as soon as Groom got engaged, Mistress 2 was suddenly all over him! This was no one-night stand either. It was an honest-to-goodness full-blown affair. Bride has no clue about Mistress 2, and you know that there is zero chance that Groom will voluntarily tell her about it. So we will. 

Bride-to-be: Ciara
Groom-to-be: Future
Mistress 1: Rihanna
Mistress 2: Keyshia Cole

Somewhat confusing, but can Mstars readers understand the reasoning?

Thankfully, all the crazy drama isn't tearing CiCi down - she's currently enjoying some personal mother-son time with adorable baby boy, Future Zahir Wilburn:

@ciara: "Baby Future Turns 3months 2day!:) He's Growing So Fast!! He Woke Up Smiling Like Always... Bouncing On Me Like I'm the Jumparoo :)" (Aug. 19).