A black-masked Britney Spears joined Rihanna in a mesmerizing show opener at the Billboard Music Awards. The pair opened the show with Rihanna’s hit song “S&M” and they did not spare any expenses. Dressed in matching leather outfits – black for Britney and white for the Barbados singer and donning chains and long sexy boots, the pair gyrated all over the stage and even engaged in a pillow fight. When the performance ended, Rihanna planted a kiss on Britney’s cheek bringing back memories of the infamous steamy smooch between Britney and Madonna.