She makes her movie debut as a tough-as-nails (though we bet she had to file hers way down!) naval weapons specialist in Battleship.
Pretty serious stuff.
But Rihanna tells Cambio that the atmosphere on set wasn't just work hard, but play hard too.
"[Director/Producer] Peter Berg is a lot of fun. He's wild. It spreads all the way down through his film and crew all the way back to the cast," she says. "We played pranks on each other constantly."
Hit the clip above to see what his costars did to an unsuspecting Taylor Kitsch.
Rihanna's not the only singer with behind-the-scenes scoop this week.