The altercation was reportedly spurned by comments about Cardi’s daughter, Kulture.
An insider tells PEOPLE that Cardi arrived at the event first. After Nicki showed up, there was an “altercation” on the second-floor balcony during a Christina Aguilera performance.
“The scene was f—— crazy,” the insider tells PEOPLE. “It was entourage against entourage.”
“They had their altercation on the second-floor balcony, right above the red carpet. All of the sudden there was a big commotion and everyone didn’t know what was going on.”
Immediately following the incident, Cardi was escorted out by security while Nicki stayed inside. Cardi was seen leaving the party barefoot with a large lump on her forehead.
“She left barefoot with her dress ripped and butt out,” source said.
Videos of the incident were posted on social media. In one video, Cardi B can be seen making a lunge towards someone, though it is not entirely clear if its the “Barbie Dreams” rapper.
Cardi is then seen throwing her shoe before she is dragged away while yelling that people were talking about her daughter. Cardi later wrote a long scathing Instagram post which she entitled “PERIOD” which did not mention Nicki by name but suggested Nicki had tried to sabotage Cardi’s career and also spoken about the rapper’s daughter, Kulture Kiari.