In the colorful images, Lil Nas X is seen wearing a pink jumpsuit, full make-up, fake breasts, and a two-tone wig while sitting on a motorcycle made of ice.
Iggy Azalea reacted to Lil Nas' makeover on Instagram, commenting, "You win Halloween 2020!"
Minaj hadn't responded to his post as of press time.
Lil Nas X is a longtime fan of Minaj. Earlier this summer, following rumors that he was running the now-extinct Minaj fan page @nasmaraj on Twitter, the rapper admitted to keeping his admiration for her a secret because he wasn't ready to come out as a homosexual.
"I didn't want people to know I was gay tbh," the Grammy-winner tweeted in June, responding to a fan's question about why he never fessed up to being a Barb.
Check out Lil Nas X's Minaj-inspired Halloween costume below.