Cardi B was all smiles after turning herself in to police on Monday more than one month after her strip club fight in New York City, but the “Bodak Yellow” rapper was hiding a big secret behind her poker face.

RadarOnline.com can exclusively report the hot-tempered star’s violent outburst all began over of a cheating scandal involving her husband, rapper Offset.

The security guard of Angels Strip Club in Queens told RadarOnline.com exclusively that August 29 began as a “quiet” night — but the evening quickly spiraled into chaos.

“The women came in here and started arguing for about 10 minutes,” he told RadarOnline.com. “Once the women started arguing it, escalated into something different, and afterward it just got crazy.”

“They were arguing about some guy, and who was cheating on who. Next thing you know, things were being thrown, glass was breaking. It wasn’t cool.”

Club manager Islam told RadarOnline.com police got involved a week later the incident, when staffer Baddie Gi filed a complaint about Cardi’s alleged attack.

As RadarOnline.com reported, new mom Cardi, 25, was charged with reckless endangerment and assault after turning herself in to New York police on October 1. She is due in court on October 29.

The star has accused her husband of cheating in the past, but defended his alleged behavior on Instagram earlier this year.

“Guess what we work things out we grew, bout to have a baby and purchasing a home together. S**t happens,” she told a fan in June. The couple welcomed baby Kulture in July.

Could Offset be cheating on Cardi B again? Sound off in the comments below

We pay for juicy info! Do you have a story for RadarOnline.com? Email us at [email protected], or call us at (866) ON-RADAR (667-2327) any time, day or night.

Get the exclusive celebrity scoop on all the stars you love before any of your friends by subscribing to our new podcast Straight Shuter below!