When it comes to S&M the bondage is usually black, but Rihanna switched things to white for her opening performance at the 2011 Billboard Music Awards. Up for a whopping 18 awards this year, including the evening's coveted Top Artist award, the 'Loud' singer started things off with her racy 'S&M' single clad in a barely there, white patent leather dominatrix ensemble, slithering across the stage at the MGM Grand Garden Arena in Las Vegas on Sunday night (May 22).

But if you're someone that prefers the black bondage, you're still in luck: Britney Spears rose up from the stage in a matching black patent leather leotard half-way through the performance, wearing a mask that made her look like a naughty Playboy Bunny searching for trouble.

While 'S&M' isn't nominated for any awards this evening -- RiRi's 'What's My Name? is up for Best R&B Song, though -- the single peaked at No. 1 and is currently No. 11 after 18 weeks on the Billboard Hot 100. Spears jumped on the remix to the 'S&M' only last month, marking the first collaboration from the two pop stars. So how do you end a performance where two of the hottest pop stars are dancing around suggestively on stage to the sound of whips and chains? With a pillow fight, of course.

Watch video of their performance after the jump.

Watch Rihanna, Britney Spears Perform at the 2011 Billboard Music Awards