WATCH: Britney Spears & Rihanna Perform "S&M" at Billboard Music Awards!

The pop stars wowed the crowd with their sexy, pillow-fighting routine at Sunday night's awards show

If you had any doubt that Britney Spears was back and hotter than ever, all you needed to do was catch her performance with Rihanna at Sunday night's Billboard Music Awards. The two stars opened the show with their remix of RiRi's smash hit "S&M" and had jaws dropping with their chain-filled, pole-dancing routine.

Clad in black leather, Spears, 29, came out in the middle of the song wearing a mask. She then revealed her identity and busted out her dance moves -- and there was even a girl-on-girl pillow fight at the end! 

Spears' career may have gone cold for a short time years ago, but it's pretty clear the princess of pop has brought the temperature back up to scorching.

Watch Britney and Rihanna's naughty performance here.

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