In a sit-down with ET's Kevin Frazier, the "FourFiveSeconds" singer admitted that she was nervous recording voice-overs for the movie, out March 27.
"You don't want to just get the job because you're famous," Rihanna said. "[I want to do] something that Dreamworks can really stand behind and not something that they will say, 'Ok, we should have thought this over.'"
The movie follows Oh (voiced by Jim Parsons), a loveable extraterrestrial who lands on Earth and finds himself on the run from his own people. On his journey, Oh forms a friendship with an adventurous girl named Tip (voiced by Rihanna). The movie also features the voices of Steve Martin and Jennifer Lopez.