The 34-year-old star, who has parted ways with Mill after nearly two years of dating, said she now wants to focus on her music career.
"To confirm, yes I am single. Focusing on my work and looking forward to sharing it with you guys really soon. Have a blessed New Year. Love you," she wrote.
Minaj and Mill, 29, began dating in early 2015, and have tried to keep the majority of their personal lives as private as possible.