Getting a part in the film came naturally to Nicki, who loves to transform the sound of her voice in her music.
"[My agency] knew I liked animation, they knew I liked to do voices, and so they said they were doing that so I thought, 'This is amazing,'" Nicki told MTV.
Although she was turned down for the role she originally wanted, "Ice Age" producers pulled a few strings to get Nicki on board.
"The original role that I was up for I didn't get. I was really mad, and the next thing you know, they called me and they said, 'We wrote in a part just for you,'" said Nicki.
Nicki remains mum on the exact character she'll play but is excited about the hard work she put in for the part.
"I did it as two different voices," she said. "We'll see what happens."