Last night's social media war between Nicki Minaj and Cardi B escalated in a way that crossed lines many thought were off limits. The feud began over album sales and quips about promotional pricing, but quickly turned personal when Nicki dragged Cardi's daughter, Kulture, into the mix. Minaj referred to Cardi's first child as "Kulture vulture" and even labeled her "ugly." In response, Cardi threatened to reveal things about Nicki's family if her daughter was mentioned again. As she fiercely defends Kulture, she again warned Minaj to leave her children out of their public battles.