Two of today’s biggest pop stars performed across the Atlantic on “The X-Factor” U.K. recently. With her current “Diamonds” song shooting up the charts to #1, Rihanna dressed in all black as rain fell from the sky during her powerful performance of her Unapologetic single.. Before RiRi touched the stage, Bruno Mars and his Hooligans started the party with his Billboard hit, “Locked Out of Heaven.” Bruno’s Unorthodox Jukebox sophomore album is set to hit stores in the U.S. on December 11.

Watch their performances after the jump…..

Thanks to Rap-Up

Rihanna Feat. Kanye West – “Diamonds (Remix)”
Bruno Mars – “Moonshine”