Nicki Minaj and Cardi B were involved in an altercation that got physical at a New York Fashion Week party.
Video circulating on social media shows Cardi B lunging toward someone and being held back at Harper's Bazaar Icons party on Friday night.
Another video shows the platinum rapper being escorted out of the event by security.
A person who witnessed the incident said Minaj was finishing up a conversation with someone when Cardi B tried to attack her, but Minaj's security guards intervened.
Cardi B, wearing a voluminous red Dolce & Gabanna gown, was seen leaving the party with what appeared to be a bump on her head.
She and Minaj have been rap rivals since Cardi B began achieving huge success over the last year.
In a post on Instagram, Cardi didn't call out Minaj by name but alluded to the fight and said she was sparked because her mothering skills were being disparaged.
She and rapper Offset recently had their first child together, a girl.
Australian Associated Press