The Bajan bad gal and the doo-wop pop singer both brought a hint of international flavor to the UK X-Factor last night.
Dressed in a skintight lace black gown, Rihanna belted "Diamonds" until she made it rain on stage, literally. As RiRi performed, it began to lightly drizzle, but leading up to the song's climax, drizzle turned into a torrential downpour.
While Rihanna's performance was melodramatic, a fedora-rocking Bruno Mars kicked up the energy with his 10-piece live band.
Bruno's currently promoting his forthcoming album Unorthodox Jukebox, which is set to hit store shelves December 11.
Watch Bruno Mars "Locked Out Of Heaven" performance below and Rihanna's up above!