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Britney Spears has been putting that breathy voice of hers in overdrive, this time collaborating with Rihanna on a hot new remix of her naughty "S&M"!

In addition to singing some of the chorus, Britney also spits out some sexy verses:

"Just one night full of sin/ Feel the pain on your skin/ Tough, I don't scream 'mercy'/ It's your turn to hurt me/ If I'm bad, tie me down/ Shut me up, gag and bound me/ 'Cuz the pain is my pleasure/ Nothing comes better."

The track debuted this morning on Z100 after Rihanna teased it on Twitter last night, saying "I got a sexy collabo comin your way supa dupa soon!!!! OH YEAH!!! By popular demand.... It's Britney bitch!"

Britney responded to Ri Ri, also via Twitter, saying "You're such a tease! I like it, like it ..."

Listen to the hot new remix below...



Britney's new album dropped late last month and has already been climbing up the charts. "It was just revealed that Nicki Minaj would be replacing Enrique
Iglesias on Brit's domestic tour, which means it may be the hottest ticket around!"

As for Rihanna, in addition to appearing on American Idol this week, it was just announced that she'll be taking the stage at the Billboard Music Awards in Vegas on May 22nd, where she'll be joining Jennifer Lopez, the Black Eyed Peas, and Taio Cruz among others.