The New York Fashion Week fight heard 'round the town happened tonight when Cardi B and Nicki Minaj were involved in a heated altercation during the Harper's Bazaar Icon party at The Plaza Hotel.

In videos captured by both E! News and fellow guests, the two rappers were seen in a scuffle towards the end of the party. An insider tells us Minaj was mingling with guests and keeping to herself when Cardi lunged at her and began shouting. Minaj then didn't move and continued on with her night. Footage also appeared on social media and showed Offset's leading lady throwing a red high heel at Minaj. She even accidentally revealed her own underwear during the tussle.

"It was so fast!" an eyewitness tells E! News. "I heart someone screaming—everyone recognized Cardi's voice—people either got out of the way or took out their phones and started filming. Nicki was surrounded by a bunch of guards and barely even looked at her. Next thing you know, shoes were flying and Cardi was on her way out."

Police tell us they responded to the altercation at 11:00 p.m. and that there were no visible injuries. However, there appeared to be a mark above the new mother's left eye.

A source also tells E! News the "staffers were mortified" by the incident.

"This event took months of planning, and it's meant to be the most exclusive and glamorous party during [New York Fashion Week]," the insider said. "This kind of behavior overshadowed months of hard work and an otherwise fabulous night."